P0590-SPEED CONTROL SWITCH 2 STUCK

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on and no other S/C Switch DTCs present.
Set Condition:
The S/C Switch 2 Signal indicates that a switch is pressed for more than 60 seconds.

Possible Causes

INTERMITTENT DTC

(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

(V937) S/C SWITCH GROUND CIRCUIT SHORTED TO VOLTAGE

(V72) S/C SWITCH 2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(V937) S/C SWITCH GROUND CIRCUIT OPEN OR HIGH RESISTANCE

(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO GROUND

SPEED CONTROL SWITCH

ENGINE CONTROL MODULE (ECM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test

1.S/C SWITCH VOLTAGES OUT OF RANGE

KEY	SIGNAL 1		SIGNAL 2
KEY	LO LIMIT	HI LIMIT	LO LIMIT	HI LIMIT
RELEASED	4.36	4.69	4.36	4.69
ON-OFF	0.50	1.10	3.53	3.90
SET	3.16	3.53	1.56	1.18
RESUME-ACCEL	3.84	4.19	1.70	2.43
CANCEL	1.59	1.97	2.43	3.22

Are the S/C Switch voltages within the ranges specified in the table when each button is pressed?

Yes
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No

Go To2

2.(V72) S/C SWITCH 2 SIGNAL CIRCUIT VOLTAGE

Select the appropriate voltage reading.

4.5 to 5.5 volts

Go To3

Below 4.5 volts

Go To6

Above 5.5 volts

Go To8

3.(V937) S/C SWITCH GROUND CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE

Is the resistance below 10.0 ohms?

Yes

Go To4

Repair the (V937) S/C Switch Ground circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

4.(V937) S/C SWITCH GROUND CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (V937) S/C Switch Ground circuit for a short to voltage.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 5

5.S/C SWITCH

Does the scan tool display below 0.1 volt with the jumper wire in place?

Yes

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

Go to 9

6.(V72) S/C SWITCH 2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 10.0 ohms?

Yes

Go To7

Repair the (V71) S/C Switch 2 Signal circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

7.(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance above 1000 ohms?

Yes

Go to 9

Repair the (V72) S/C Switch 2 Signal circuit for a short to ground.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

8.(V72) S/C SWITCH 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (V72) S/C Switch 2 Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 9

9.ENGINE CONTROL MODULE (ECM)

Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver.1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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