P086B-NEUTRAL POSITION SENSOR RANGE/PERFORMANCE
For a complete wiring diagram, refer to the Wiring Information.
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When Monitored:
Continuously with the ignition on.
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Set Condition:
The Powertrain Control Module (PCM) detects that during a gearshift, the neutral switch did not change state.
Possible Causes |
|---|
| THE REVERSE SWITCH AND THE NEUTRAL SWITCH HARNESS CONNECTORS ARE REVERSED |
| (K804) NEUTRAL SWITCH SIGNAL CIRCUIT IS OPEN/HIGH RESISTANCE |
| (K804) NEUTRAL SWITCH SIGNAL CIRCUIT SHORTED TO GROUND |
| (Z906) GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| FAULTY OR STICKING NEUTRAL SWITCH |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, erase DTCs in the PCM. |
| 3. | Test drive the vehicle shifting through the gears several times. |
| 4. | With the scan tool, select View DTCs. |
Is the status Active for this DTC?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK FOR THE REVERSE SWITCH AND THE NEUTRAL SWITCH HARNESS CONNECTORS REVERSED
| 1. | Turn the ignition off. |
| 2. | Using the wiring diagram as a guide, check for the Reverse Switch and Neutral Switch harness connectors reversed. |
Are the Reverse Switch and Neutral Switch harness connectors reversed?
Yes
- Change the harness connectors to the proper switches.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 3
3. CHECK THE (K804) NEUTRAL SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the Neutral Switch harness connector. |
| 3. | Disconnect the PCM C1 harness connector. |
| 4. | Measure the resistance between ground and the (K804) Neutral Switch Signal circuit at the PCM C1 harness connector. |
Is the resistance above 10k Ohms?
Yes
- Go To 4
No
- Repair the (K804) Neutral Switch Signal circuit for a short to ground.
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Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
4. CHECK THE (K804) NEUTRAL SWITCH SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
 |
| 1. | Measure the resistance of the (K804) Neutral Switch Signal circuit between the Neutral Switch harness connector and the PCM C1 harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the (K804) Neutral Switch Signal circuit for an open or high resistance.
-
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
5. CHECK THE (Z906) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
 |
| 1. | Measure the resistance between ground and the (Z906) Ground circuit at the Neutral Switch harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 6
No
- Repair the (Z906) Ground circuit for an open or high resistance.
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Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
| 1. | Replace the Neutral Switch in accordance with the service information. |
| 2. | Reconnect the Neutral Switch harness connector. |
| 3. | Reconnect the PCM C1 harness connector. |
| 4. | Turn the ignition on. |
| 5. | With the scan tool, erase DTCs. |
| 6. | Start the engine and test drive the vehicle. |
| 7. | With the scan tool, select View DTCs. |
Did the DTC return?
Yes
- Go To 7
No
- Repair complete.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Neutral Switch and the Powertrain Control Module. |
| 2. | Look for any chafed, pierced, pinched, or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. |
| 4. | Perform any Technical Service Bulletins that may apply. |
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace the Powertrain Control Module in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).