Chrysler 300M 2002 Service Manual page 2660

P0579-SPEED CONTROL SWITCH #1 PERFORMANCE —
TEST
3 Turn the ignition off.
Remove the Speed Control Switches from the steering wheel.
Measure the resistance across each Switch Control Switch.
Monitor the ohmmeter while pressing each function button on each switch.
Resume/Accel - 15,400 ohms
Cancel - 909 +/- 9 ohms
Decel (Coast) - 2940 +/- 30 ohms
On/Off - 0 ohms
Set - 6650 +/- 66 ohms
Does the function on the Speed Control Switches have the correct ohm value?
Yes → Go To 4
→ Replace the Speed Control Switch that had the incorrect resis-
No
4 Turn the ignition off.
Disconnect the Speed Control On/Off Switch harness connector.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the Speed Control Switch Signal circuit and the
Sensor ground circuit in the Speed Control harness connector.
Is the resistance below 5.0 ohms?
Yes → Repair the Speed Control Switch Signal circuit shorted to the
→ Go To 5
No
5 Turn the ignition off.
Disconnect the Speed Control On/Off Switch harness connector.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Disconnect the PCM harness connector.
Measure the voltage of the Speed Control Switch Signal circuit at the Speed Control
harness connector.
Is the is the voltage above 5.0 volts?
Yes → Repair the Speed Control Switch Signal circuit shorted to the
→ Go To 6
No
6 Turn the ignition off.
Disconnect the Speed Control On/Off Switch harness connector.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the Speed Control Switch Signal circuit
at the Speed Control harness connector.
Is the resistance below 100 ohms?
Yes → Repair the Speed Control Switch Signal circuit shorted to the
→ Go To 7
No
ACTION
tance value.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
battery voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
DRIVEABILITY - NGC
231
Continued
APPLICABILITY
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All
All
All