Service Procedure

1. Remove kick pad.

2. Remove ECM and replace PROM with new service PROM.

3. Reinstall ECM and kick pad.

4. Start engine and run until operating temperature is reached.

5. Turn ignition switch to "off".

6. Connect TK00000 Tech I Diagnostic Computer to ALDL connector.

7. Start engine and check idle speed. Record idle speed on work order for later reference.

8. Turn ignition switch to "off".

9. Disconnect tach filter connector. This should force duty signal to 10% (full rich).

10. Start engine and measure oxygen sensor output voltage. Depending on idle speed recorded in Step 7 perform appropriate procedure below:

^ If idle in Step 7 was equal to or less than 950 RPM (Manual Transaxle) or 1200 RPM (Automatic Transaxle):

- And, if output voltage is equal to or greater than 550 mV (Manual Transaxle) or 650 mV (Automatic Transaxle) go to Step 13.

- Or, if output voltage is less than 550 mV (Manual Transaxle) or 650 mV (Automatic Transaxle) go to Step 11.



^ If idle in Step 7 was greater than 950 RPM (Manual Transaxle) or 1200 RPM (Automatic Transaxle):

- And, if output voltage is equal to or greater than 600 mV (Manual Transaxle) or 700 mV (Automatic Transaxle) turn ignition switch to "off" and go to Step 13.

- Or, if output voltage is less than 600 mV (Manual Transaxle) or 700 mV (Automatic Transaxle) go to step 11.

11. Turn ignition switch to "off".

# 12. Inspect wiring between oxygen sensor and ECM for opens or shorts; repair as required. If repair to wiring is made, repeat Step 10.

If wiring has no opens or shorts, replace oxygen sensor by the following procedure:

# a. Bring engine to normal operating temperature.

# b. Apply penetrating oil or equivalent lubricant to oxygen sensor thread area and wait until absorbed.

# c. Disconnect oxygen sensor electrical connector.

# d. Remove heat tube and heat shield.





# e. By using about an 8 inch punch or chisel, tap oxygen sensor in hex area with hammer to loosen oxygen sensor see Figure. Do not use an impact wrench. Take great care not to strip threads.

# f. Unscrew oxygen sensor after it is loose.

# g. If damage occurs to manifold when removing oxygen sensor, replace manifold as follows:

# 1g) Disconnect battery ground cable.

# 2g) Raise Vehicle.

# 3g) Disconnect exhaust pipe bracket at block.

# 4g) Disconnect exhaust pipe at manifold.

# 5g) Lower vehicle.

# 6g) Remove exhaust manifold and install new manifold.




# 7g) Raise vehicle.

# 8g) Connect exhaust pipe at manifold.

# 9g) Connect exhaust pipe bracket at block.

# 10g) Lower vehicle.

# 11g) Reconnect battery ground cable.

# h. Install and secure new oxygen sensor to exhaust manifold.

# i. Install and secure heat shield and heat tube.

# j. Connect oxygen sensor electrical connector.

# k. Bring engine to operating temperature and retest (steps 6 through 11.





13. Reconnect tach filter connector disconnected in Step 9.

14. Disconnect TK00000 Tech Diagnostic Computer from ALDL connector.

15. Install Campaign Identification Label.