Jeep Wrangler TJ. Manual — part 120
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the C3 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure resistance of (K66) P/S Switch Signal circuit from the Power Steering
Pressure Switch harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the open in the (K66) P/S Switch Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
4
Measure the resistance between ground and the (K66) P/S Pressure Switch Signal
circuit at the P/S Pressure Switch connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K66) P/S Switch Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→ Go To 5
5
Measure the resistance between ground and the (Z987) Ground circuit at the Power
Steering Pressure Switch connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (Z987) Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
6
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
205
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P0551-POWER STEERING SWITCH PERFORMANCE —
Continued
Symptom:
P0562-BATTERY VOLTAGE LOW
When Monitored and Set Condition:
P0562-BATTERY VOLTAGE LOW
When Monitored:
The engine running. The engine speed greater than 380 RPM.
Set Condition:
Battery voltage is 1 volt less than desired system voltage.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
BATTERY POSITIVE CIRCUIT HIGH RESISTANCE
GENERATOR GROUND HIGH RESISTANCE
GENERATOR OPERATION
(K125) GEN FIELD CONTROL CIRCUIT OPEN
(K125) GEN FIELD CONTROL CIRCUIT SHORTED TO GROUND
(Z20) GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: Make sure the Battery is in good condition. Using the Midtronics
Battery Tester, test the Battery before continuing.
NOTE: Inspect the vehicle for after market accessories that may exceed the
Generator System output.
Turn the ignition off.
NOTE: Make sure the generator drive belt is in good operating condition.
NOTE: Inspect the fuses in the PDC. If a fuse is found to be open use the
wiring diagram/schematic as a guide, inspect the wiring and connectors for
damage.
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 3.
206
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
2
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Ignition on, engine not running.
NOTE: Make sure all wires are clear of the engine’s moving parts.
Start the engine.
Allow the engine to reach normal operating temperature.
Measure the voltage between the Generator B+ Terminal and the Battery + Post.
Is the voltage above 0.4 of a volt?
All
Yes
→ Repair the Battery Positive circuit for high resistance between
the Generator and Battery.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→ Go To 3
3
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: Make sure all wires are clear of the engine’s moving parts.
Measure the voltage between the Generator case and Battery ground post.
Is the voltage above 0.1 of a volt?
All
Yes
→ Repair Generator Ground for high resistance, Generator Case to
Battery ground side.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Generator Field harness connector.
Use a 12-volt test light and jump it across the Generator Field harness connector.
Ignition on, engine not running.
With the DRBIII
t, actuate the Generator Field Control circuit.
Does the test light illuminate brightly and flash on and off?
All
Yes
→ Replace the Generator.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the C2 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K125) Gen Field Control circuit from the Generator
Field harness connector to the appropriate terminal of the special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (K125) Gen Field Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
207
DRIVEABILITY - NGC
P0562-BATTERY VOLTAGE LOW —
Continued
TEST
ACTION
APPLICABILITY
6
Measure the resistance between ground and the (K125) Gen Field Control circuit in
the Generator Field harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K125) Gen Field Control
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→ Go To 7
7
Using a 12-volt test connected to 12-volts, probe the (Z20) Ground circuit in the
Generator Field harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 8
No
→ Repair the open in the (Z20) Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
8
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
208
DRIVEABILITY - NGC
P0562-BATTERY VOLTAGE LOW —
Continued
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