Check Starter Motor Circuit

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK POWER SUPPLY TO STARTER MOTOR
1. Remove the fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Check that the starter motor connector F27 connection is clean and tight.
5. Check voltage between starter motor connector F27 terminal 2 (B/R) and ground using a digital circuit tester.
  - Battery voltage should exist.
OK or NG
- OK: GO TO 2.
- NG: Check harness between the battery and the starter motor for open circuit.
Fig 1: Checking Voltage Between Starter Motor Connector F27 Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK VOLTAGE DROP ON STARTER MOTOR CIRCUIT
Check voltage between starter motor connector F27 terminal 2 (B/R) and battery positive terminal using a digital circuit tester.
- Ignition switch in: Less than 0.5V START.
OK or NG
- OK: GO TO 3.
- NG: Check harness between the battery and the starter motor for poor continuity.
Fig 2: Checking Voltage Between Starter Motor Connector F27 Terminal 2 And Battery Positive Terminal
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK VOLTAGE DROP ON STARTER MOTOR GROUND CIRCUIT
Check voltage between starter motor case and battery negative terminal using a digital circuit tester.
- Ignition switch in: Less than 0.2V START.
OK or NG
- OK: Starter motor ground circuit is OK. Further inspection is necessary. Refer to "WORK FLOW ".
- NG: Check harness between the starter motor case and ground for poor continuity.
Fig 3: Checking Voltage Between Starter Motor Case And Battery Negative Terminal
Courtesy of NISSAN MOTOR CO., U.S.A.