2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Holding Function Circuit; 2006 MY LX470 [05/2005

Last Modified: 4-30-2014	6.6 J	Doc ID: RM000000WRO006X
Model Year: 2006	Model: LX470	Prod Date Range: [05/2005 - ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Cranking Holding Function Circuit; 2006 MY LX470 [05/2005 - ]

Cranking Holding Function Circuit

DESCRIPTION

The starter is controlled by the ECM. When the ECM detects a start signal (STSW) from the ignition switch, this system monitors the engine speed (NE) and continues to operate the starter until it has determined that the engine has started (engine speed reaches approximately 500 rpm). If the engine is already running and the ignition switch is turned to START, the ECM will not operate the starter.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.	CHECK OPERATION OF ENGINE CRANKING

(a) When turning the ignition switch to the START position check if the starter motor starts.

CHECK FOR INTERMITTENT PROBLEMS

2.	READ VALUE USING INTELLIGENT TESTER (STA SIGNAL)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Enter the following menu: DIAGNOSIS / ENHANCED OBDII / DATA LIST / PRIMARY / STARTER SIG.

OK:

Ignition Switch Position	STARTER SIG
ON	OFF
Start	ON

GO TO STEP 5

3.	INSPECT ECM (STA AND STSW VOLTAGE)

(a) Measure the voltage of the E6 ECM connector while cranking the engine (ignition switch is in the START position).

Standard voltage:

Tester Connection	Specified Condition
E6-11 (STA) - E6-1 (E1)	9 to 14 V
E6-12 (STSW) - E6-1 (E1)	9 to 14 V

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

REPLACE ECM

GO TO STEP 9

4.	INSPECT PARK / NEUTRAL POSITION SWITCH

(a) Disconnect the P1 park / neutral position switch connector.

(b) Measure the resistance between each terminal shown below when the shift lever is moved to each position.

Standard resistance:

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

REPLACE PARK / NEUTRAL POSITION SWITCH

CHECK AND REPAIR HARNESS OR CONNECTOR (PARK / NEUTRAL POSITION SWITCH - ECM)

5.	INSPECT STARTER RELAY

(a) Remove the starter relay from the engine room relay block.

(b) 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)

REPLACE STARTER RELAY

6.	CHECK HARNESS AND CONNECTOR (PARK / NEUTRAL POSITION SWITCH - STARTER RELAY, STARTER RELAY - BODY GROUND)

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Remove the STARTER relay from the engine room relay block.

(b) Measure the voltage of the engine room relay block and body ground.

Standard voltage:

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

CHECK AND REPAIR HARNESS AND CONNECTOR (STARTER RELAY - BATTERY)

8.	INSPECT STARTER ASSEMBLY

(a) Inspect starter assembly .

REPAIR OR REPLACE STARTER ASSEMBLY

CHECK AND REPAIR HARNESS OR CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY)

9.	INSPECT IGNITION SWITCH ASSEMBLY

(a) Disconnect the I18 ignition switch connector.

(b) Measure the resistance of the connector terminals shown in the chart below.

Standard resistance:

Switch Position	Tester Connection	Specified Condition
START	7 - 8	Below 1 Ω

REPLACE IGNITION SWITCH ASSEMBLY

CHECK AND REPAIR HARNESS OR CONNECTOR (ECM - IGNITION SWITCH, IGNITION SWITCH - BATTERY)