Mt Model
DTC detecting condition:
Detected when two consecutive driving cycles with fault occur.
Trouble symptom:
Improper idling
CAUTION:
Use the check board when measuring the ECM terminal voltage and resistance. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD
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NOTE:
After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE
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Wiring diagram:
Engine Electrical System Ref. to WIRING SYSTEM>ENGINE ELECTRICAL SYSTEM .
- CHECK INPUT SIGNAL OF ECM
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- Turn the ignition switch to ON.
- Place the shift lever in a position other than neutral.
- Measure the voltage between ECM connector and engine ground.
Connector & terminal
(B62) No. 39 (+) - Engine ground (-):
Is the voltage 10 V or more?
Yes: Repair the poor contact of ECM connector.
No: Go to 2.
- CHECK HARNESS BETWEEN ECM AND NEUTRAL POSITION SWITCH (SHORT TO GROUND)
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- Turn the ignition switch to OFF.
- Disconnect the connector from ECM.
- Disconnect the connector from the neutral position switch.
- Measure the resistance between the ECM connector and engine ground.
Connector & terminal
(B62) No. 39 - Engine ground:
Is the resistance 1 MΩ or more?
Yes: Check the neutral position switch. Ref. to MANUAL TRANSMISSION>SWITCHES AND HARNESS>INSPECTION .
No: Repair the short circuit to ground in the harness between ECM connector and neutral position switch connector.