Suzuki Vitara (LY) 2016-2017 · Service Manual K14C · Diagnostic Information and Procedures

Inspection of ECM and Its Circuits

Precautions: General safety (00)

Voltage Check
NOTE:
•As each terminal voltage is affected by battery voltage, check that battery voltage is 11 V or more when ignition is “ON”.
•Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use oscilloscope for its check.
•Before performing this inspection, read “Precautions for ECM Circuit Inspection” under Precautions for Engine (K14C).
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[A]: ECM connector (View: [a])
“C01” connector
Terminal No. Wire color Circuit Normal voltage Condition
C01-1* WHT Fuel injector No.2 drive circuit (low side) Refer to reference waveform.
C01-2* GRY WGV-VSV drive circuit 10 to 14 V Ignition: “ON”
Refer to reference waveform.
WGV-VSV signal
C01-3* GRN OCV drive circuit 10 to 14 V Ignition: “ON”
Refer to reference waveform.
OCV signal
C01-4* BRN Throttle actuator drive circuit (open) Refer to reference waveform.
Throttle actuator signal
C01-5* YEL ABV-VSV drive circuit 10 to 14 V Ignition: “ON”
Refer to reference waveform.
ABV-VSV signal
C01-6 GRY MAF sensor reference voltage signal 4.5 to 5.5 V Ignition: “ON”
C01-7 PNK Boost pressure sensor power supply circuit 4.5 to 5.5 V Ignition: “ON”
C01-8 LT BLU Fuel pressure sensor and MAP sensor power supply circuit 4.5 to 5.5 V Ignition: “ON”
C01-9 RED TP sensor power supply circuit 4.5 to 5.5 V Ignition: “ON”
C01-10 GRN TP sensor (main) signal circuit 0.8 to 1.0 V Ignition: “ON”
Accelerator pedal: Released
4.3 to 4.5 V Ignition: “ON”
Accelerator pedal: Fully depressed
C01-11 WHT TP sensor (sub) signal circuit 4.0 to 4.2 V Ignition: “ON”
Accelerator pedal: Released
0.5 to 0.7 V Ignition: “ON”
Accelerator pedal: Fully depressed
C01-12* BRN HO2S-2 signal circuit Refer to reference waveform.
HO2S-2 signal
C01-13 BEG HO2S-2 shield ground circuit Below 0.3 V Ignition: “ON”
C01-14* WHT CAN (low) communication circuit 2 Refer to reference waveform.
CAN communication signal
C01-15* YEL HO2S-1 heater drive circuit Refer to reference waveform.
HO2S-1 heater signal and HO2S-2 heater signal
C01-16* BRN Fuel injector No.2 drive circuit (high side) Refer to reference waveform.
Fuel injector signal
C01-17* BLK EVAP canister purge valve drive circuit 10 to 14 V Ignition: “ON”
Refer to reference waveform.
EVAP canister purge valve signal
C01-18 — — — —
C01-19* LT GRN Throttle actuator drive circuit (close) Refer to reference waveform.
Throttle actuator signal
C01-20* RED CMP sensor signal circuit Approx. 0 V or 4 to 5 V Ignition: “ON”
Refer to reference waveform.
CMP sensor signal and CKP sensor signal
C01-21 BLU ECT sensor signal circuit 3.2 to 3.6 V Ignition: “ON”
ECT: 0 °C (32 °F)
1.0 to 1.4 V Ignition: “ON”
ECT: 50 °C (122 °F)
0.2 to 0.5 V Ignition: “ON”
ECT: 100 °C (212 °F)
C01-22 RED Fuel pressure sensor signal circuit Approx. 1.0 V Engine: Idle speed after warming up
Reference fuel rail pressure: 3 MPa (30.6 kgf/cm2, 435 psi, 30 bar)
Approx. 1.5 V Engine: Running at 4,000 rpm after warming up
Reference fuel rail pressure: 4.6 MPa (46.9 kgf/cm2, 667 psi, 46 bar)
C01-23 BEG ECT sensor and boost pressure sensor with IAT sensor-2 ground circuit Below 0.3 V Ignition: “ON”
C01-24 BEG MAF sensor with IAT sensor-1 ground circuit Below 0.3 V Ignition: “ON”
C01-25 GRY TP sensor shield ground circuit Below 0.3 V Ignition: “ON”
C01-26 BLK TP sensor ground circuit Below 0.3 V Ignition: “ON”
C01-27 YEL HO2S-2 ground circuit Below 0.3 V Ignition: “ON”
C01-28 LT BLU HO2S-1 shield ground circuit Below 0.3 V Ignition: “ON”
C01-29* RED CAN (high) communication circuit 2 Refer to reference waveform.
CAN communication signal
C01-30* RED HO2S-2 heater drive circuit Refer to reference waveform.
HO2S-1 heater signal and HO2S-2 heater signal
C01-31* BLU Fuel injector No.3 drive circuit (high side) Refer to reference waveform.
Fuel injector signal
C01-32* YEL Fuel injector No.1 drive circuit (low side) Refer to reference waveform.
C01-33* GRN Fuel injector No.1 drive circuit (high side) Refer to reference waveform.
Fuel injector signal
C01-34* RED High pressure fuel pump drive circuit Refer to reference waveform.
High pressure fuel pump signal
C01-35 GRY CMP sensor ground circuit Below 0.3 V Ignition: “ON”
C01-36 — — — —
C01-37* WHT Knock sensor signal circuit 1 1 to 2 V Engine: Idle speed
Refer to reference waveform.
Knock sensor signal
C01-38 BEG Fuel pressure sensor ground circuit Below 0.3 V Ignition: “ON”
C01-39 PPL Boost pressure sensor signal circuit Approx. 2.0 V Engine: Idle speed after warming up
Reference boost pressure: 101 kPa (1.03 kgf/cm2, 14.6 psi, 1.01 bar)
Refer to reference waveform.
MAF sensor signal, boost pressure sensor signal and MAP sensor signal
C01-40 BRN MAP sensor signal circuit Approx. 2.0 V Ignition: “ON”
Approx. 0.8 V Engine: Idle speed after warming up
Barometric pressure: 101 kPa, 758 mmHg
Refer to reference waveform.
MAF sensor signal, boost pressure sensor signal and MAP sensor signal
C01-41* GRN Ignition coil No.2 drive circuit Approx. 0 V Ignition: “ON”
Refer to reference waveform.
C01-42* BRN Ignition coil No.3 drive circuit Approx. 0 V Ignition: “ON”
Refer to reference waveform.
C01-43* RED HO2S-1 signal circuit Refer to reference waveform.
HO2S-1 signal
C01-44 — — — —
C01-45* GRN MAF sensor signal circuit 0.1 to 1.0 V Ignition: “ON”
Refer to reference waveform.
MAF sensor signal, boost pressure sensor signal and MAP sensor signal
C01-46* RED Fuel injector No.3 drive circuit (low side) Refer to reference waveform.
C01-47* LT BLU Fuel injector No.4 drive circuit (low side) Refer to reference waveform.
C01-48* LT GRN Fuel injector No.4 drive circuit (high side) Refer to reference waveform.
Fuel injector signal
C01-49 BLU High pressure fuel pump power supply circuit 4.5 to 5.5 V Ignition: “ON”
C01-50* PNK CKP sensor signal circuit Approx. 0 V or 4 to 5 V Ignition: “ON”
Refer to reference waveform.
C01-51 GRY CKP sensor ground circuit Below 0.3 V Ignition: “ON”
C01-52* BLU Knock sensor signal circuit 2 1 to 2 V Engine: Idle speed
Refer to reference waveform.
Knock sensor signal
C01-53 BEG MAP sensor ground circuit Below 0.3 V Ignition: “ON”
C01-54 YEL IAT sensor-1 signal circuit 2.2 to 2.6 V Ignition: “ON”
IAT-1: 20 °C (68 °F)
1.3 to 1.7 V Ignition: “ON”
IAT-1: 40 °C (104 °F)
C01-55 GRN IAT sensor-2 signal circuit 2.2 to 2.6 V Ignition: “ON”
IAT-2: 20 °C (68 °F)
1.3 to 1.7 V Ignition: “ON”
IAT-2: 40 °C (104 °F)
C01-56* YEL Ignition coil No.1 drive circuit Approx. 0 V Ignition: “ON”
Refer to reference waveform.
C01-57* PNK Ignition coil No.4 drive circuit Approx. 0 V Ignition: “ON”
Refer to reference waveform.
C01-58 GRN HO2S-1 ground circuit Below 0.3 V Ignition: “ON”
C01-59 — — — —
C01-60* BLU Generator LIN communication circuit Refer to reference waveform.
Generator LIN communication signal
“E01” connector
Terminal No. Wire color Circuit Normal voltage Condition
E01-1 GRN Main power supply circuit 3 10 to 14 V Ignition: “ON”
E01-2 BLK ECM ground circuit 3 Below 0.3 V Ignition: “ON”
E01-3 GRN Main power supply circuit 2 10 to 14 V Ignition: “ON”
E01-4 BLK ECM ground circuit 2 Below 0.3 V Ignition: “ON”
E01-5 GRN Main power supply circuit 1 10 to 14 V Ignition: “ON”
E01-6 BLK ECM ground circuit 1 Below 0.3 V Ignition: “ON”
E01-7 LT BLU APP sensor (main) signal circuit 0.6 to 0.9 V Ignition: “ON”
Accelerator pedal: Released
3.7 to 4.4 V Ignition: “ON”
Accelerator pedal: Fully depressed
E01-8 BLU APP sensor (main) ground circuit Below 0.3 V Ignition: “ON”
E01-9 BRN APP sensor (main) power supply circuit 4.5 to 5.5 V Ignition: “ON”
E01-10 — — — —
E01-11 — — — —
E01-12 GRY A/C refrigerant pressure sensor power supply circuit 4.5 to 5.5 V Ignition: “ON”
E01-13 — — — —
E01-14 — — — —
E01-15 — — — —
E01-16 — — — —
E01-17 — — — —
E01-18 — — — —
E01-19 — — — —
E01-20 LT GRN Starting motor control relay signal circuit Approx. 0 V Ignition: “ON”
6 to 12 V Ignition: “START”
E01-21 — — — —
E01-22 — — — —
E01-23 LT GRN Cruise control command switch signal circuit (cruise control model) 3.1 to 3.5 V Ignition: “ON”
2.0 to 2.4 V Ignition: “ON”
“RES / +” switch: ON (RES / + switch kept pushed)
1.2 to 1.6 V Ignition: “ON”
“SET / –” switch: ON (SET / – switch kept pushed)
0.3 to 0.6 V Ignition: “ON”
“CANCEL” switch: ON (CANCEL switch kept pushed)
0 to 0.2 V Ignition: “ON”
“CRUISE” switch: ON (CRUISE switch kept pushed)
E01-24 — — — —
E01-25 — — — —
E01-26 — — — —
E01-27 — — — —
E01-28 — — — —
E01-29 YEL APP sensor (sub) signal circuit 0.2 to 0.5 V Ignition: “ON”
Accelerator pedal: Released
1.8 to 2.2 V Ignition: “ON”
Accelerator pedal: Fully depressed
E01-30 WHT APP sensor (sub) ground circuit Below 0.3 V Ignition: “ON”
E01-31 BLK APP sensor (sub) power supply circuit 4.5 to 5.5 V Ignition: “ON”
E01-32 — — — —
E01-33 — — — —
E01-34 LT GRN A/C refrigerant pressure sensor ground circuit Below 0.3 V Ignition: “ON”
E01-35 BLU Oil temperature sensor ground circuit Below 0.3 V Ignition: “ON”
E01-36 RED A/C refrigerant pressure sensor signal circuit 0.9 to 1.9 V Engine: Running
A/C compressor: Not operating
1.9 to 3.4 V Engine: Running
A/C compressor: Operating
E01-37 — — — —
E01-38 — — — —
E01-39 — — — —
E01-40 — — — —
E01-41 — — — —
E01-42 GRY Oil temperature sensor signal circuit 2.35 to 2.73 V Ignition: “ON”
Engine oil temperature: 20 °C (68 °F)
0.68 to 1.00 V Ignition: “ON”
Engine oil temperature: 50 °C (122 °F)
0.24 to 0.27 V Ignition: “ON”
Engine oil temperature: 90°C (194 °F)
E01-43 — — — —
E01-44 — — — —
E01-45 — — — —
E01-46 — — — —
E01-47 — — — —
E01-48 — — — —
E01-49 GRY Radiator cooling fan relay No.2 drive circuit 10 to 14 V Engine: Idle speed
ECT < 100.8 °C (213.4 °F)
A/C switch: OFF
Approx. 0 V Engine: Idle speed
ECT > 102.8 °C (217.0 °F)
A/C switch: OFF
E01-50 BRN Radiator cooling fan relay No.3 drive circuit 10 to 14 V Engine: Idle speed
ECT < 100.8 °C (213.4 °F)
A/C switch: OFF
Approx. 0 V Engine: Idle speed
ECT: 2 sec. after ECT > 102.8 °C (217.0 °F)
A/C switch: OFF
E01-51 — — — —
E01-52 — — — —
E01-53 BEG Cruise control command switch ground circuit (cruise control model) Below 0.3 V Ignition: “ON”
E01-54 PPL CPP No.2 switch signal circuit (M/T model) 10 to 14 V Ignition: “ON”
Clutch pedal: Released
Approx. 0 V Ignition: “ON”
Clutch pedal: Fully depressed
E01-55 GRN CPP No.1 switch signal (M/T model) or transmission range sensor signal circuit (A/T model) Approx. 0 V Ignition: “ON”
Clutch pedal: Fully depressed
Select lever: P or N position (A/T model)
10 to 14 V Ignition: “ON”
Clutch pedal: Released (M/T model)
Select lever: Other than P or N position (A/T model)
E01-56 — — — —
E01-57 — — — —
E01-58 — — — —
E01-59 — — — —
E01-60 — — — —
E01-61* WHT CAN (low) communication circuit 1 Refer to reference waveform.
CAN communication signal
E01-62 — — — —
E01-63 — — — —
E01-64 — — — —
E01-65 — — — —
E01-66 — — — —
E01-67 — — — —
E01-68 — — — —
E01-69 — — — —
E01-70 GRN Fuel pump relay drive circuit Refer to reference waveform.
Fuel pump relay signal
E01-71 — — — —
E01-72 LT GRN Radiator cooling fan relay No.1 drive circuit 10 to 14 V Engine: Idle speed
ECT < 97.8 °C (208.0 °F)
A/C switch: OFF
Approx. 0 V Engine: Idle speed
ECT > 99.8 °C (211.6 °F)
A/C switch: OFF
E01-73 PNK Main relay drive circuit Approx. 0 V Ignition: “ON”
10 to 14 V Ignition: 30 sec. after ignition “OFF”
E01-74 — — — —
E01-75 — — — —
E01-76 YEL Brake light switch signal circuit (normal open) Approx. 0 V Ignition: “ON”
Brake pedal: Released
10 to 14 V Ignition: “ON”
Brake pedal: Fully depressed
E01-77 — — — —
E01-78 — — — —
E01-79 — — — —
E01-80 — — — —
E01-81 — — — —
E01-82 — — — —
E01-83* RED CAN (high) communication circuit 1 Refer to reference waveform.
CAN communication signal
E01-84 — — — —
E01-85 — — — —
E01-86 BLU Brake switch signal circuit (normal close) (cruise control model) 10 to 14 V Ignition: “ON”
Brake pedal: Released
Approx. 0 V Ignition: “ON”
Brake pedal: Fully depressed
E01-87 — — — —
E01-88 — — — —
E01-89 — — — —
E01-90 — — — —
E01-91 — — — —
E01-92 WHT Ignition signal circuit Approx. 0 V Ignition: “OFF” or “ACC”
10 to 14 V Ignition: “ON”
E01-93 — — — —
E01-94 GRY A/C compressor relay drive circuit 10 to 14 V Engine: Running
A/C compressor: Not operating
Approx. 0 V Engine: Running
A/C compressor: Operating
Reference Waveform
NOTE:
•Display includes the following types of data:
img
[A]: Waveform of channel 1 [C]: VOLT/DIV of each channel
[B]: Ground level of each channel [D]: TIME/DIV
•Waveform varies depending on measurement condition and vehicle spec.
Fuel injector signal
Fuel injector No.1 signal (high side) (1)
Channel Probe Terminal No.
1 + C01-33
– E01-6
Fuel injector No.1 signal (low side) (2)
Channel Probe Terminal No.
2 + C01-32
– E01-6
Fuel injector No.4 signal (high side) (3)
Channel Probe Terminal No.
3 + C01-48
– E01-6
Fuel injector No.4 signal (low side) (4)
Channel Probe Terminal No.
4 + C01-47
– E01-6
Fuel injector No.2 signal (high side) (1)
Channel Probe Terminal No.
1 + C01-16
– E01-6
Fuel injector No.2 signal (low side) (2)
Channel Probe Terminal No.
2 + C01-1
– E01-6
Fuel injector No.3 signal (high side) (3)
Channel Probe Terminal No.
3 + C01-31
– E01-6
Fuel injector No.3 signal (low side) (4)
Channel Probe Terminal No.
4 + C01-46
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
5. Signal is outputted, but fuel is not injected. 6. Fuel is injected.
Fuel injector No.1 signal and ignition coil No.1 signal
Fuel injector No.1 signal (low side) (1)
Channel Probe Terminal No.
1 + C01-32
– E01-6
Ignition coil No.1 signal (2)
Channel Probe Terminal No.
2 + C01-56
– E01-6
CMP sensor signal (3)
Channel Probe Terminal No.
3 + C01-20
– E01-6
CKP sensor signal (4)
Channel Probe Terminal No.
4 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
5. Signal is outputted, but fuel is not injected. 7. Camshaft 360° angle
6. Fuel is injected. 8. Crankshaft 720° angle
Fuel injector No.2 signal and ignition coil No.2 signal
Fuel injector No.2 signal (low side) (1)
Channel Probe Terminal No.
1 + C01-1
– E01-6
Ignition coil No.2 signal (2)
Channel Probe Terminal No.
2 + C01-41
– E01-6
CMP sensor signal (3)
Channel Probe Terminal No.
3 + C01-20
– E01-6
CKP sensor signal (4)
Channel Probe Terminal No.
4 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
5. Signal is outputted, but fuel is not injected. 7. Camshaft 360° angle
6. Fuel is injected. 8. Crankshaft 720° angle
Fuel injector No.3 signal and ignition coil No.3 signal
Fuel injector No.3 signal (low side) (1)
Channel Probe Terminal No.
1 + C01-46
– E01-6
Ignition coil No.3 signal (2)
Channel Probe Terminal No.
2 + C01-42
– E01-6
CMP sensor signal (3)
Channel Probe Terminal No.
3 + C01-20
– E01-6
CKP sensor signal (4)
Channel Probe Terminal No.
4 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
5. Signal is outputted, but fuel is not injected. 7. Camshaft 360° angle
6. Fuel is injected. 8. Crankshaft 720° angle
Fuel injector No.4 signal and ignition coil No.4 signal
Fuel injector No.4 signal (low side) (1)
Channel Probe Terminal No.
1 + C01-47
– E01-6
Ignition coil No.4 signal (2)
Channel Probe Terminal No.
2 + C01-57
– E01-6
CMP sensor signal (3)
Channel Probe Terminal No.
3 + C01-20
– E01-6
CKP sensor signal (4)
Channel Probe Terminal No.
4 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
5. Signal is outputted, but fuel is not injected. 7. Camshaft 360° angle
6. Fuel is injected. 8. Crankshaft 720° angle
WGV-VSV signal
Channel Probe Terminal No.
1 + C01-2
– E01-6
Measurement condition
•WGV-VSV: 10% open (using active test of SUZUKI scan tool)
img
OCV signal
Channel Probe Terminal No.
1 + C01-3
– E01-6
Measurement condition
•Engine: Racing after warming up
•Accelerator pedal: Fully depressed position
img
1. OCV signal
Throttle actuator signal
Throttle actuator signal (open) (1)
Channel Probe Terminal No.
1 + C01-4
– E01-6
Throttle actuator signal (close) (2)
Channel Probe Terminal No.
2 + C01-19
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
Measurement condition
•Engine: Racing at 3,000 rpm after warming up
img
ABV-VSV signal
Channel Probe Terminal No.
1 + C01-5
– E01-6
Measurement condition
•ABV-VSV: OFF → ON → OFF (using active test of SUZUKI scan tool)
img
1. OFF 2. ON
HO2S-2 signal
Channel Probe Terminal No.
1 + C01-12
– E01-6
Measurement condition
•Engine: Racing after warming up
img
1. Engine: Racing 2. Engine: Idle speed
CAN communication signal
CAN (high) communication signal (1)
Channel Probe Terminal No.
1 + C01-29
E01-83
– E01-6
CAN (low) communication signal (2)
Channel Probe Terminal No.
2 + C01-14
E01-61
– E01-6
Measurement condition
•Ignition: “ON”
img
HO2S-1 heater signal and HO2S-2 heater signal
HO2S-1 heater signal (1)
Channel Probe Terminal No.
1 + C01-15
– E01-6
HO2S-2 heater signal (2)
Channel Probe Terminal No.
2 + C01-30
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
EVAP canister purge valve signal
Channel Probe Terminal No.
1 + C01-17
– E01-6
Measurement condition
•EVAP canister purge valve: 10% open (using active test of SUZUKI scan tool)
img
CMP sensor signal and CKP sensor signal
CMP sensor signal (1)
Channel Probe Terminal No.
1 + C01-20
– E01-6
CKP sensor signal (2)
Channel Probe Terminal No.
2 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
CKP sensor signal (Non-ENG A-STOP model)
Channel Probe Terminal No.
1 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
CKP sensor signal (ENG A-STOP model)
Channel Probe Terminal No.
1 + C01-50
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
High pressure fuel pump signal
Channel Probe Terminal No.
1 + C01-34
– E01-6
Measurement condition
Engine: Idle speed after warming up
img
Knock sensor signal
Channel Probe Terminal No.
1 + C01-37
C01-52
– E01-6
Measurement condition
•Engine: Racing at 3,000 rpm after warming up
img
MAF sensor signal, boost pressure sensor signal and MAP sensor signal
MAF sensor signal (1)
Channel Probe Terminal No.
1 + C01-45
– E01-6
Boost pressure sensor signal (2)
Channel Probe Terminal No.
2 + C01-39
– E01-6
MAP sensor signal (3)
Channel Probe Terminal No.
3 + C01-40
– E01-6
Measurement condition
•Engine: Racing after warming up
img
Ignition coil signal
Channel Probe Terminal No.
1 + C01-56 (No.1)
C01-41 (No.2)
C01-42 (No.3)
C01-57 (No.4)
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
1. Ignition coil signal
HO2S-1 signal
Channel Probe Terminal No.
1 + C01-73
– E01-6
Measurement condition
•Engine: Idle speed after warming up
img
Generator LIN communication signal
Channel Probe Terminal No.
1 + C01-60
– E01-6
Measurement condition
•Ignition: “ON”
img
1. LIN communication signal
Fuel pump relay signal
Channel Probe Terminal No.
1 + E01-70
– E01-6
Measurement condition
•Ignition: “OFF” → “ON” → “START”
img
1. Fuel pump relay signal 3. Ignition: “ON”
2. Ignition: “OFF” 4. Ignition: “START”