Battery is Undercharged or Overcharged
Step
| Action
| Value(s)
| Yes
| No
|
1
| Perform the
Charging System Check
.
Is the generator OK?
| --
|
Go to Step 2
|
Go to Step 13
|
2
|
- Turn OFF all accessories. Connect the generator 4-way connector
(if disconnected).
- Start the engine and run at 2500 RPM.
- Check the voltage across the battery terminals.
Is the voltage within the specified range?
| 13-16 V
|
Go to Step 3
|
Go to Step 5
|
3
| Stop the engine. Perform
the
Battery Electrical Drain/Parasitic Load Test
.
Is the parasitic load below the specified value?
| 22 ma
| System OK
|
Go to Step
4
|
4
| Determine
the source of the excessive parasitic drain and repair as necessary.
Is the repair complete?
| --
| System OK
| --
|
5
| Was the voltage across the battery terminals with the engine
running at 2500 RPM too low?
| --
|
Go to Step 6
|
Go to Step 9
|
6
|
- Disconnect the generator 4-way connector. Turn the ignition switch
to RUN.
- Use a DMM to measure the CKT 225 voltage in cavity B of the generator
connector.
Is the voltage above the specified value?
| 12 V
|
Go to Step 7
|
Go to Step 10
|
7
| Check CKT 225 between the generator and the PCM for an
Intermittent shorted/grounded condition or a poor connection.
Is CKT 225 OK?
| --
|
Go to Step 14
|
Go to Step 8
|
8
| Repair
CKT 225 as necessary.
Is CKT 225 repair complete?
| --
|
Go to Step 15
| --
|
9
| Check the Generator 4-way connector for a mis-wired condition in cavity
D. This cavity should not be in this vehicle.
Has the mis-wired condition been repaired?
| --
|
Go to Step 15
| --
|
10
|
- Disconnect or backprobe the CKT 225 connector at the PCM
- Turn the ignition switch to RUN.
- Use a DMM to check the voltage output of the PCM to CKT 225.
Is the voltage above the specified value?
| 12 V
|
Go to Step 11
|
Go to Step 12
|
11
| Repair CKT 225 for a shorted, grounded, or open condition.
Is the CKT 225 repair complete?
| --
|
Go to Step 15
| --
|
12
| Repair or replace the PCM. Refer to
Powertrain Control Module Replacement
.
Is the PCM repair complete?
| --
|
Go to Step 15
| --
|
13
| Replace the generator. Refer to
Generator Replacement
.
Is the repair complete?
| --
|
Go to Step 15
| --
|
14
|
- Disconnect the battery negative cable.
- Disconnect and clean all connections between the battery positive
terminal and the generator output terminal. Check all cables for an intermittent
open condition. Refer to
Starting and Charging Schematics
.
- Disconnect and clean all connections in the ground circuit between
the battery negative terminal and the generator housing. Check all cables
for an intermittent open condition.
- Connect the battery negative cable.
Is the repair complete?
| --
|
Go to Step 15
| --
|
15
|
- Turn OFF all accessories. Connect the generator 4-way connector
(if disconnected).
- Start the engine and run at 2500 RPM.
- Check the voltage across the battery terminals.
Is the voltage within the specified range?
| 13-16 V
| System
OK
|
Go to Step 5
|
