Cranking Holding Function Circuit

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the engine switch's start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When an ECM receives the STSW signal, it turns on the ST CUT relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR output signal travels through the park/neutral position (PNP) switch to the STARTER relay, causing the starter to activate.
When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.

WIRING DIAGRAM

Refer to DTC P0617 (Click here).

INSPECTION PROCEDURE

1. CHECK CRANKING

1. When turning the engine switch to the START position, check whether the starter motor starts.

OK	CHECK FOR INTERMITTENT PROBLEMS

NG

2. READ VALUE OF INTELLIGENT TESTER (STA SIGNAL)

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG) and turn the tester ON.

3. Enter the following menus: Power train / Engine / Data List / Starter Signal.

4. Check the result when the engine switch is turned to on (IG) and START.
   

   Standard:

   Engine Switch Position	ON (IG)	START
   STARTER SIG	OFF	ON

OK	Go to step 6

NG

3. INSPECT ECM (STAR AND STSW VOLTAGE)

1. Measure the voltage of the A5 and E4 ECM connectors while cranking the engine.

   Standard voltage:

   Tester Connection	Specified Condition
   STAR (E4-4) - E1 (E4-7)	9 to 14 V
   STSW (A5-19) - E1 (E4-7)	9 to 14 V

   Result:

   Terminal STAR	Terminal STSW	Proceed to
   9 to 14 V	9 to 14 V	A
   0 V	9 to 14 V	B
   0 V	0 V	C

B	REPLACE ECM
C	Go to step 10

A

4. INSPECT ST CUT RELAY

1. Remove the ST CUT relay from the engine room J/B and R/B No. 2.

2. Measure the resistance of the ST CUT relay.

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage applied to terminals 1 and 2)

NG	REPLACE ST CUT RELAY

OK

5. INSPECT PARK / NEUTRAL POSITION SWITCH (A/T) OR CLUTCH SWITCH ASSEMBLY (M/T)

1. Disconnect the park/neutral position (PNP) switch (A/T) or clutch switch (M/T) connector.

2. Measure the resistance between each terminal shown below when the shift lever is moved to each range.

   Standard resistance (A/T):

   Shift Position	Tester Connection	Specified Condition
   P	4 - 5	Below 1 Ω
   N	4 - 5	Below 1 Ω

   Standard resistance (M/T):

   Clutch Pedal Operation	Tester Connection	Specified Condition
   Depressed	1 - 2	Below 1 Ω

NG	REPLACE PARK / NEUTRAL POSITION SWITCH (A/T) OR CLUTCH SWITCH ASSEMBLY (M/T)

OK
CHECK AND REPAIR HARNESS AND CONNECTOR ((PARK/NEUTRAL POSITION SWITCH - ECM, ECM - ST CUT RELAY, ST)

6. INSPECT STARTER RELAY

1. Remove the starter relay from the engine room J/B and R/B No. 1.

2. Measure the resistance of the starter relay.

   Standard resistance:

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage applied to terminals 1 and 2)

NG	REPLACE STARTER RELAY

OK

7. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - STARTER RELAY)

1. Check the harness and the connectors between the park/neutral position switch and the starter relay.

   1. Disconnect the E45*1, A24*2 switch connector.*1: A/T*2: M/T

   2. Remove the starter relay from the engine room J/B and R/B No. 1.

   3. Measure the resistance of the wire harness side connectors.

      Standard resistance (A/T) (Check for open):

      Tester Connection	Specified Condition
      Park/Neutral position switch (E45-5) - Starter relay (1)	Below 1 Ω

      Standard resistance (M/T) (Check for open):

      Tester Connection	Specified Condition
      Clutch start switch (A24-2) - Starter relay (1)	Below 1 Ω

      Standard resistance (A/T) (Check for short):

      Tester Connection	Specified Condition
      Park/Neutral position switch (E45-5) or Starter relay (1) - Body ground	10 kΩ or higher

      Standard resistance (M/T) (Check for short):

      Tester Connection	Specified Condition
      Clutch start switch (A24-2) or Starter relay (1) - Body ground	10 kΩ or higher

2. Check the harness and the connector between the starter relay and the body ground.

   1. Remove the starter relay from the engine room J/B and R/B No. 1.

   2. Measure the resistance of the starter relay and the body ground.

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      Starter relay (2) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8. INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)

1. Remove the starter relay from the engine room J/B and R/B No. 1.

2. Measure the voltage of the engine room J/B and R/B No. 1 and the body ground.

   Standard voltage:

   Tester Connection	Specified Condition
   Starter relay (5) - Body ground	9 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9. INSPECT STARTER ASSEMBLY

NG	REPAIR OR REPLACE STARTER ASSEMBLY

OK
REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY)

10. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM)

1. Check the harness and the connectors between the power source control ECU and ECM.

   1. Disconnect the power source control ECU connector.

   2. Disconnect the A5 ECM connector.

   3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open):

      Tester Connection	Specified Condition
      J55-39 (STSW) - A5-19 (STSW)	Below 1 Ω

      Standard resistance (Check for short):

      Tester Connection	Specified Condition
      J55-39 (STSW) or A5-19 (STSW) - Body ground	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START