Refer to
Cell 20: Engine Controls -- PCM PNP Switch and Starter Enable
Control
for a wiring diagram.
Circuit Description
The PCM has the ability to disable starter operation if conditions inappropriate for starter operation exist. The PCM disables the starter if the engine is running, if a correct VTD password is not received from the VTD module or if the vehicle operator attempts to engage the starter for an extended period of time.
The PCM controlled starter system consists of the following components:
| • | Starter enable relays. |
| • | The Transaxle Range / Park Neutral Position switch. |
| • | The ignition switch. |
| • | The starter solenoid. |
| • | The PCM. |
Diagnostic Aids
The PCM Controlled Starter Diagnosis table is intended to identify electrical malfunctions that can occur with the system. For additional system diagnosis, refer to Starting System Description . For starter motor diagnosis and on-vehicle service, refer to Starting System Check .
Check for the following conditions:
| • | Poor connection at the PCM , the starter enable relay, the Transaxle Range / PNP switch, the ignition switch or the starter solenoid. |
| Inspect harness connectors for the following conditions: |
| - | Backed out terminals. |
| - | Improper mating. |
| - | Broken locks. |
| - | Improperly formed or damaged terminals. |
| - | Poor terminal to wire connection. |
| • | Damaged harness. |
| Inspect the wiring harness for damage. |
| • | Either of the following conditions can cause the PCM to disable starter operation: |
| - | The engine has been running for longer than 10 seconds. |
| - | The starter has been continuously engaged for longer than 15 seconds. |
| - | A correct VTD password has not been received from the VTD module. |
Test Description
Numbers below refer to step numbers in the diagnostic table.
-
Verifies that the condition is present.
-
Checks for battery positive voltage at starter enable relay #1
-
For wiring harness service, refer to Wiring Repairs in Wiring Systems. For starter solenoid diagnosis and repair, refer to Engine Electrical.
-
This vehicle is equipped with a PCM which utilizes an Electrically Erasable Read Only Memory (EEPROM) When the PCM is being replaced, the new PCM must be programmed.
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||||
|
Important: If any of the following DTCs are set, diagnose the DTC first: Attempt to start the vehicle. Does the engine crank? | -- | Go to Diagnostic Aids | ||||||||||
Is the test lamp ON? | -- | |||||||||||
4 |
Is the test lamp ON with the ignition switch in the crank position? | -- | ||||||||||
5 |
Is the test lamp ON? | -- | ||||||||||
6 |
Is the test lamp ON with the ignition switch in the crank position? | -- | ||||||||||
7 |
Is the test lamp ON with the ignition switch in the crank position? | -- | ||||||||||
8 |
Is the test lamp ON? | -- | ||||||||||
9 |
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components. Is the test lamp ON? | -- | ||||||||||
10 |
Is the test lamp ON with the ignition switch in the crank position? | -- | ||||||||||
Was a problem found? | -- | |||||||||||
12 | Locate and repair open in CKT 542. Is action complete? | -- | -- | |||||||||
13 |
Was a problem found? | -- | ||||||||||
14 |
Is the test lamp ON? | -- | ||||||||||
15 | Locate and repair open in CKT 806 to starter enable relay #1. Is action complete? | -- | -- | |||||||||
16 |
Was a problem found? | -- | ||||||||||
17 | Replace the ignition switch and lock cylinder. Refer to Ignition Lock Cylinder Replacement - On Vehicle in Steering Wheel and Column-Tilt. Is action complete? | -- | -- | |||||||||
18 |
Is the test lamp ON? | -- | ||||||||||
19 |
Was a problem found? | -- | ||||||||||
20 |
Was a problem found? | -- | ||||||||||
21 | Replace the transaxle range / park neutral position switch. Is action complete? | -- | -- | |||||||||
22 |
Was a problem found? | -- | ||||||||||
23 |
Was a problem found? | -- | ||||||||||
|
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is action complete? | -- | -- | ||||||||||
25 |
Was a problem found? | -- | ||||||||||
26 |
Was a problem found? | -- | ||||||||||
27 | Replace starter enable relay #1. Is action complete? | -- | -- | |||||||||
28 | Locate and repair open in CKT 806 to starter enable relay #2. Refer to Wiring Repairs in Wiring Systems. Is action complete? | -- | -- | |||||||||
29 | Locate and repair open in CKT 575 to starter enable relay #2. Refer to Wiring Repairs in Wiring Systems. Is action complete? | -- | -- | |||||||||
30 | Locate and repair open in CKT 6 between starter enable relay #2 and the starter motor. Refer to Wiring Repairs in Wiring Systems. Is action complete? | -- | -- | |||||||||
31 |
Was a problem found? | -- | ||||||||||
32 | Replace starter enable relay #2. Is action complete? | -- | -- | |||||||||
33 |
Was a problem found? | -- | ||||||||||
34 | Service the starter. Refer to Starter Motor Replacement in Engine Electrical. Is the action complete? | -- | -- | |||||||||
35 | Attempt to start the vehicle. Does the engine crank? | -- | System OK |
