Diagnostic Procedure

CHECK DTC WITH ECM
- Check P code with CONSULT-II ENGINE.
  Turn ignition switch ON and select SELF-DIAGNOSTIC RESULTS mode for ENGINE with CONSULT-II.
  
  Refer to MALFUNCTION INDICATOR LAMP (MIL) .
OK or NG
1. OK (with CONSULT-II): GO TO 2.
2. OK (without CONSULT-II): GO TO 4.
3. NG: Check ignition signal circuit for engine control. Refer to IGNITION SIGNAL .
CHECK INPUT SIGNAL (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select TCM INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
3. Read out the value of ENGINE SPEED.
  
  Fig 1: Checking Input Signal (With CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Check engine speed changes according to throttle position.
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 3.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between TCM and ECM
- Resistor and ignition coil
  Refer to IGNITION SIGNAL .
OK or NG
1. OK: GO TO 6.
2. NG: Repair or replace damaged parts.
CHECK INPUT SIGNAL (WITHOUT CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM connector F57 terminal 39 and ground.
  
  Fig 2: Checking Input Signal (Without CONSULT-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: 0.6 (idle speed) - 2.2V (3,000 rpm)
OK or NG
1. OK: GO TO 6.
2. NG: GO TO 5.
DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between TCM and ECM
- Resistor and ignition coil
  Refer to IGNITION SIGNAL .
OK or NG
1. OK: GO TO 6.
2. NG: Repair or replace damaged parts.
CHECK DTC
Perform DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE .

OK or NG
1. OK: INSPECTION END
2. NG: GO TO 7.
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
1. OK: INSPECTION END
2. NG: Repair or replace damaged parts.