Diagnostic Procedure

Turn ignition switch OFF, and restart engine.

Is engine running? 

Yes or No 

1. Yes (With CONSULT-II): GO TO 2.
2. Yes (Without CONSULT-II): GO TO  3.
3. No: GO TO  4.

With CONSULT-II 

1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
   Fig 1: Scan Tool Display - Active Test

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Make sure that all circuits do not produce a momentary engine speed drop.

OK or NG 

1. OK: INSPECTION END 
2. NG: GO TO  7.

Without CONSULT-II 

1. Let engine idle.
2. Read the voltage signal between ECM terminal 1 and ground with an oscilloscope.
3. Verify that the oscilloscope screen shows the signal wave as shown below.
   Fig 2: Checking Voltage Signal Between ECM Terminal 1 And Ground Using An Oscilloscope

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: INSPECTION END 
2. NG: GO TO  7.

1. Turn ignition switch OFF.
2. Disconnect distributor harness connector F17.
   Fig 3: Identifying Distributor & Resistor

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Turn ignition switch ON.
4. Check voltage between ignition coil terminal 7 and ground with CONSULT-II or tester.
   Fig 4: Checking Voltage Between Ignition Coil Terminal And Ground With CONSULT-II Or Tester

   Courtesy of NISSAN MOTOR CO., U.S.A.

Voltage : Battery voltage 

OK or NG 

1. OK: GO TO  6.
2. NG: GO TO 5.

Check the following.

• Harness connectors E43, M65
• Harness connectors M59, F27
• Harness for open or short between ignition coil and ignition switch

  Repair harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect distributor harness connector F13.
3. Check harness continuity between power transistor terminal 2 and engine ground.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Also check harness for short to power.

OK or NG 

1. OK: GO TO 7.
2. NG: Repair open circuit or short to power in harness or connectors.

1. Stop engine.
2. Disconnect distributor harness connector F13.
   Fig 5: Identifying Distributor & Resistor

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal 1 and power transistor terminal 1.

   Refer to WIRING DIAGRAM .

   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: Repair open circuit or short to ground or short to power in harness or connectors.

1. Remove distributor cap.
2. Check resistance as shown in the figure.
   Fig 6: Checking Ignition Coil - Terminal Resistance Specification Chart

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 7: Checking Ignition Coil - Checking Terminal Resistance

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 9.
2. NG: Replace distributor assembly as a unit.

1. Disconnect distributor harness connector F17.
2. Check power transistor resistance between terminals 2 and 8.
   Fig 8: Checking Power Transistor - Terminal Resistance Specification Chart

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 9: Checking Power Transistor - Terminal Resistance

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 10.
2. NG: Replace distributor assembly.

1. Strip tape covering resistor.
Fig 10: Identifying Distributor & Resistor
Courtesy of NISSAN MOTOR CO., U.S.A.
2. Disconnect resistor harness connector.
3. Check harness continuity between ignition coil terminal 8 and resistor terminal 1, resistor terminal 2 and ECM terminal 2.

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

OK or NG 

1. OK: GO TO 11.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Check resistance between resistor terminals 1 and 2.

Fig 11: Checking Resistance Resistor Terminals

Courtesy of NISSAN MOTOR CO., U.S.A.

Resistance : Approximately 2.2 kΩ [at 25°C (77°F)] 

OK or NG 

1. OK: GO TO 12.
2. NG: Replace resistor.

Perform , "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

INSPECTION END