Cruise Control Inoperative WO/ETC
Important: Perform the following steps in order to avoid misdiagnosis:
• Inspect for proper operation of the following lamps: - The brake lamps - The CHMSL lamps • Inspect the throttle linkage for mechanical binding that may cause
a system malfunction. • Test for a stored PCM Diagnostic Trouble Code (DTC). Refer to Engine Controls. • Test for a stored Traction Control System (TCS) DTC. Refer to Antilock Brakes. • The vehicle speed is less than 25 mph. • The Park/Neutral Position Switch is placed into one of the following
positions: - PARK - REVERSE - NEUTRAL - 1st GEAR • There are low engine RPMs. • There are high engine RPMs (fuel cut-off). Refer to Engine Controls for cruise control inhibit criteria diagnosis.
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 |
Does the test lamp light? | -- | Go to Step 2 | Go to Step 9 | ||||||||
2 | Connect a test lamp between the cruise control module terminal F and terminal E. Does the test lamp light? | -- | Go to Step 3 | Go to Step 10 | ||||||||
3 |
Does the test lamp light? | -- | Go to Step 4 | Go to Step 11 | ||||||||
4 | Connect a test lamp between the cruise control module connector terminal E and terminal B. While observing the test lamp, press and hold the SET/COAST switch. Does the test lamp light? | -- | Go to Step 5 | Go to Step 12 | ||||||||
5 |
Does the test lamp light? | -- | Go to Step 13 | Go to Step 6 | ||||||||
6 | Using a J 39200 Digital Multi-Meter (DMM), measure the voltage at the cruise control module connector between the terminal D and terminal E. Does the voltage measured equal the specified value? | 12V | Go to Step 7 | Go to Step 16 | ||||||||
7 | Connect a test light between the cruise control module connector between terminal E and terminal B. Does the test lamp light? | -- | Go to Step 8 | Go to Step 23 | ||||||||
8 |
Refer to Multifunction Lever Replacement . Is the repair complete? | -- | System OK | -- | ||||||||
9 | Repair one of the following conditions in CKT 139, between the cruise control module connector terminal F and splice S165:
Is the repair complete? | -- | System OK | -- | ||||||||
10 | Repair the open in circuit 1650, between the cruise control module terminal E connector and G109. Is the repair complete? | -- | System OK | -- | ||||||||
11 |
Does the test lamp light? | -- | Go to Step 15 | Go to Step 14 | ||||||||
12 |
Refer to Multifunction Lever Replacement . Is the repair complete? | -- | System OK | -- | ||||||||
13 |
Refer to Multifunction Lever Replacement . Is the repair complete? | -- | System OK | -- | ||||||||
14 |
Refer to Multifunction Lever Replacement . Is the repair complete? | -- | System OK | -- | ||||||||
15 |
Refer to Multifunction Lever Replacement . Is the repair complete? | -- | System OK | -- | ||||||||
16 |
Does the measured voltage equal the specified value? | 12V | Go to Step 19 | Go to Step 17 | ||||||||
17 |
Does the voltage measured equal the specified value? | 12V | Go to Step 20 | Go to Step 18 | ||||||||
18 | Repair the open in circuit 139, between connector C250 terminal B and connector C215 terminal M: Is the repair complete? | -- | System OK | -- | ||||||||
19 |
Important: Inspect the cruise control release (brake) switch for the proper alignment. Is the repair complete? | -- | System OK | -- | ||||||||
20 | Determine if the vehicle is automatic or manual transmission. Does the vehicle have an automatic transmission? | -- | Go to Step 21 | Go to Step 22 | ||||||||
21 | Repair one of the following conditions in circuit 139, between connector C250 terminal B and the cruise control release (brake) switch connector terminal B:
Is the repair complete? | -- | System OK | -- | ||||||||
22 |
Is the repair complete? | -- | System OK | -- | ||||||||
23 | Connect a test lamp between the cruise control module connector between terminal E and terminal C. Does the test lamp light? | -- | Go to Step 29 | Go to Step 24 | ||||||||
24 |
Does the voltage vary within the specified value? | 0-5 volts | Go to Step 25 | Go to Step 30 | ||||||||
25 |
Does the scan tool indicate SMCC INHIBITED? | -- | Go to Step 31 | Go to Step 26 | ||||||||
26 |
Does the measured value equal the specified value? | 12V | Go to Step 27 | Go to Step 28 | ||||||||
27 | Replace the cruise control module. Is the repair complete? | -- | System OK | -- | ||||||||
28 |
Is the repair complete? | -- | System OK | -- | ||||||||
29 |
Refer to Multifunction Lever Replacement . Is the repair complete? | -- | System OK | -- | ||||||||
30 | Repair the open or the poor connection in circuit 817 between the cruise control module and splice S242. Is the repair complete? | -- | System OK | -- | ||||||||
31 | Use the scan tool in order to monitor the following values in order to assure that the values are within the specified ranges:
Are the above values within the specified ranges? | VSS 25-100 mph trans range 2nd, 3rd, or 4th gear voltage 9-17 volts engine speed 500-5400 rpm | Go to Step 32 | Refer to Powertrain On Board Diagnostic (OBD) System Check . | ||||||||
32 | Service the PCM. Refer to Powertrain On Board Diagnostic (OBD) System Check . Is the repair complete? | -- | System OK | -- |
Cruise Control Inoperative W/ETC
Diagnostic Aids
Important: Perform the following in order to avoid misdiagnosis.
• Inspect for proper operation of brake lamps and clutch switch,
if equipped. • EMI on the speed sensor signal circuit may cause erratic cruise
control operation.
Conditions for Enabling Cruise Control
The vehicle speed is greater than 40 km/h (25 mph).
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Cruise Control Schematics | |||
1 | Did you perform the Cruise Control System Check? | Go to Step 2 | |
2 |
Did the scan tool parameter change state? | Go to Step 3 | Go to Step 9 |
3 |
Did the cruise control Set/Coast parameter change state? | Go to Step 4 | Go to Step 14 |
4 |
Did the cruise control Resume Accelerate parameter change state? | Go to Step 5 | Go to Step 15 |
5 |
Did the stop lamp switch parameter change state? | Go to Step 6 | Go to Step 10 |
6 |
Did the cruise release switch parameter change state? | Go to Step 7 | Go to Step 11 |
7 | Is the vehicle equipped with a manual transmission? | Go to Step 8 | Go to Step 29 |
8 |
Did the CPP switch parameter change state? | Go to Step 29 | Go to Step 12 |
9 |
Did the test lamp illuminate? | Go to Step 13 | Go to Step 21 |
10 |
Did the test lamp illuminate? | Go to Step 16 | Go to Step 22 |
11 |
Did the test lamp illuminate? | Go to Step 18 | Go to Step 23 |
12 |
Did the test lamp illuminate? | Go to Step 20 | Go to Step 24 |
13 | Test the cruise control ON switch signal circuit for a open, high resistance, short to ground or short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 28 |
14 | Test the cruise control Set/Coast signal circuit for a open, high resistance, short to ground or short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 28 |
15 | Test the cruise control Resume/Accelerate signal circuit for a open, high resistance, short to ground or short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 28 |
16 | Test the stop lamp switch signal circuit for a open, high resistance, short to ground or short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 17 |
17 | Check the stop lamp switch for proper adjustment. Refer to Stop Lamp Switch Adjustment in Hydraulic Brakes. Did you find and correct the condition? | Go to Step 35 | Go to Step 25 |
18 | Test the cruise release switch signal circuit for a open, high resistance, short to ground or short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 19 |
19 | Check the cruise release switch for proper adjustment. Refer to Cruise Control Cable Adjustment in Hydraulic Brakes. Did you find and correct the condition? | Go to Step 35 | Go to Step 26 |
20 | Test the CPP switch signal circuit for a open, high resistance, short to ground or short to voltage. Refer to Testing for Electrical Intermittents and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 27 |
21 | Repair the open, high resistance or short to ground in the multifunction turn signal lever ignition positive voltage feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 35 | -- |
22 | Repair the open, high resistance or short to ground in the stop lamp switch battery positive voltage feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 35 | -- |
23 | Repair the open, high resistance or short to ground in the cruise release switch battery positive voltage feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 35 | -- |
24 | Repair the open, high resistance or short to ground in the CPP switch battery positive voltage feed circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 35 | -- |
25 | Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 30 |
26 | Inspect for poor connections at the harness connector of the cruise release switch. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 31 |
27 | Inspect for poor connections at the harness connector of the CPP switch. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 32 |
28 | Inspect for poor connections at the harness connector of the multifunction turn signal lever. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 33 |
29 | Inspect for poor connections at the harness connector of the PCM. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 35 | Go to Step 34 |
30 | Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes. Did you complete the repair. | Go to Step 35 | -- |
31 | Replace the cruise release switch. Refer to Cruise Control Release Switch Replacement . Did you complete the repair. | Go to Step 35 | -- |
32 | Replace the CPP switch. Refer to Clutch Pedal Position Switch Replacement in Clutch. Did you complete the repair. | Go to Step 35 | -- |
33 | Replace the multifunction turn signal lever. Refer to Multifunction Lever Replacement . Did you complete the repair? | Go to Step 35 | -- |
34 |
Important: The PCM must be reprogrammed before replacement. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. | Go to Step 35 | -- |
35 | Operate the vehicle with in the conditions for cruise control operation. Does the cruise control system operate properly? | System OK | Go to Step 2 |
