Trouble Shooting

NOTE: If problem is intermittent, check for faulty wiring and components by wiggling the wiring harnesses and components (DO NOT vigorously wiggle relays).

Ensure actuator cable is not too loose (may cause vehicle to lose speed when driving up hills) or too tight (causes high idle speed). Check for codes. See RETRIEVING CODES under SELF-DIAGNOSTICS. If code(s) are set, perform appropriate procedure under CODE TESTING. If no codes are set, go to DIAGNOSIS BY SYMPTOM table.
If suspecting that cruise control ECU is not receiving an input from a switch or speed sensor, check input signal circuits. See INPUT SIGNAL CIRCUITS under CIRCUIT TESTING. If problem is still present after all testing, replace cruise control ECU.

DIAGNOSIS BY SYMPTOM

Symptom

⁽¹⁾ Procedure No.

Speed Cannot Be Set

No Codes Are Set (Normal Code)

10, ⁽²⁾, ⁽³⁾, 1, 6, 5, ⁽⁴⁾ *

Codes Cannot Be Displayed

Unwanted Canceling

No Codes Are Set (Normal Code)

10, ⁽²⁾, ⁽³⁾, 1, 6, 5, ⁽⁴⁾ *

Codes Cannot Be Displayed

Actual Speed Differs From Set Speed

⁽²⁾, 3, ⁽⁴⁾, 2

Shifts Between 3rd Gear & Overdrive Uphill (Hunting)

3, 4

Speed Setting Does Not Cancel

When Clutch Pedal Is Pressed

7, ⁽⁴⁾ *

When Brake Pedal Is Pressed

1, ⁽⁴⁾ *

When Parking Brake Is Applied

5, ⁽⁴⁾ *

When Shifting Into Neutral

6, ⁽⁴⁾ *

Cruise Control Switch Does Not Work

⁽³⁾, ⁽⁴⁾ *

Speeds Less Than 25 MPH (40 KM/H)

Speed Can Be Set

⁽²⁾, ⁽⁴⁾ *

Speed Setting Does Not Cancel

⁽²⁾, ⁽⁴⁾ *

Poor Response In Accel & Resume

3, ⁽⁴⁾ *

Overdrive Does Not Resume ⁽⁵⁾

Diagnostic Codes

Are Erased

Cannot Be Displayed

Are Displayed When Should Not Be

Cruise Iicator Light Stays On Or Does Not Come On

⁽¹⁾	See appropriate TEST under CIRCUIT TESTING .

⁽²⁾	Perform procedures for Codes 21 and 23. See CODE TESTING .

⁽³⁾	Perform procedures for Codes 32 and 34. See CODE TESTING .

⁽⁴⁾	Perform procedures for Codes 11, 12 and 13. See CODE TESTING .

⁽⁵⁾	It is normal if the transmission is slow to resume Overdrive (system is designed to operate like this). However, it should shift eventually.