P0585-S/C SWITCH PLAUSIBILITY BETWEEN SWITCH #1 AND #2

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The ECM detects a discrepency between S/C Switch #1 and S/C Switch #2 signals for 10.0 seconds.

Possible Causes

INTERMITTENT CONDITION

HIGH RESISTANCE IN THE S/C SWITCH SIGNAL CIRCUIT

HIGH RESISTANCE IN THE S/C SWITCH GROUND CIRCUIT

S/C SWITCHES

ENGINE CONTROL MODULE

Diagnostic Test

1.CHECK FOR ACTIVE DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.HIGH RESISTANCE IN THE S/C SWITCH SIGNAL CIRCUIT

Is the resistance below 10.0 ohms for each measurement?

Yes

Go To3

Repair the S/C Switch Signal circuit(s) for high resistance.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

3.HIGH RESISTANCE IN THE SENSOR GROUND CIRCUIT

Is the resistance below 10.0 ohms for both measurements?

Yes

Go To4

Repair the S/C Switch Ground circuit for high resistance.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.S/C SWITCHES

Did this DTC set again?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

The repair is complete.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).