Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Check voltage between ECM terminal 104 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 2.
Fig 1: Checking Throttle Control Motor Relay Power Supply Circuit-I
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E9.
3. Check continuity between ECM terminal 104 and IPDM E/R terminal 47. Refer to Wiring Diagram.
  1. Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 4.
2. NG: GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E11, F2
- Harness for open or short between ECM and IPDM E/R
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUSE
1. Disconnect 15A fuse.
2. Check 15A fuse for blown.
OK or NG
1. OK: GO TO 8.
2. NG: Replace 15A fuse.
CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I
1. Check voltage between ECM terminal 3 and ground under the following conditions with CONSULT-II or tester.
  
  Fig 2: Terminal Voltage Chart Of Throttle Control Motor Relay Input Signal Circuit-I
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 6.
Fig 3: Checking Throttle Control Motor Relay Input Signal Circuit-I
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector E8.
4. Check continuity between ECM terminal 3 and IPDM E/R terminal 42. Refer to Wiring Diagram.
  1. Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 8.
2. NG: GO TO 7.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E12, F3
- Harness for open or short between ECM and IPDM E/R
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG
1. OK: Replace IPDM E/R. Refer to IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) .
2. NG: Repair or replace harness or connectors.