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 PASS-Key® III 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 relay #1. |
| • | Starter enable relay #2. |
| • | The 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 Starter and Charging in Electrical Diagnosis section 8A-30. For starter motor diagnosis and on-vehicle service, refer to Cranking System section 6D2.
Check for the following conditions:
| • | Poor connection at the PCM , the starter enable relays, the 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 5 seconds. |
| - | The starter has been continuously engaged for longer than 60 seconds. |
| - | A correct VTD password has not been received from the PASS-Key® III module. |
Test Description
Number(s) below refer to step number(s) 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 Repair Procedures in Electrical Diagnosis. For starter solenoid diagnosis and repair, refer to Cranking System Section 6D2
-
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 | Value(s) | 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? | -- | Refer to Diagnostic Aids | ||||||||||
Is the test light ON? | -- | |||||||||||
4 |
Is the test light ON with the ignition switch in the crank position? | -- | ||||||||||
5 |
Is the test light ON? | -- | ||||||||||
6 |
Is the test light ON with the ignition switch in the crank position? | -- | ||||||||||
7 |
Is the test light ON with the ignition switch in the crank position? | -- | ||||||||||
8 |
Is the test light ON? | -- | ||||||||||
9 |
Is the test light ON? | -- | ||||||||||
10 |
Is the test light 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 light 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. Refer to Steering Wheel and Column On-Vehicle Service . Is action complete? | -- | -- | |||||||||
18 |
Is the test light ON? | -- | ||||||||||
19 |
Was a problem found? | -- | ||||||||||
20 |
Was a problem found? | -- | ||||||||||
21 | Replace the transaxle range / park neutral position switch. Refer to 4T65-E Automatic Transaxle On-Vehicle Service . Is action complete? | -- | -- | |||||||||
22 |
Was a problem found? | -- | ||||||||||
23 |
Was a problem found? | -- | ||||||||||
Replace the PCM. Important: The replacement PCM must be programmed. 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 Repair Procedures in Electrical Diagnosis. Is action complete? | -- | -- | |||||||||
29 | Locate and repair open in CKT 575 to starter enable relay #2. Refer to Repair Procedures in Electrical Diagnosis. Is action complete? | -- | -- | |||||||||
30 | Locate and repair open in CKT 6 between starter enable relay #2 and the starter motor. Refer to Repair Procedures in Electrical Diagnosis. 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 Cranking System section 6D2. | -- | -- | |||||||||
35 | Attempt to start the vehicle. Does the engine crank? | -- | System OK |
