Front-Wheel-Drive Car Service Manual #81-270-9003
14-58 MULTI-POINT FUEL-INJECTION
Vehicle Speed Oxygen Sensor State Baro. Read Update
Throttle Body Minimum Air Flow Check Procedure
(1) Warm engine in Park or Neutral until the cooling fan has cycled on and off at least once.
(2) Hook-up timing check device and Tachometer.
(3) Disconnect the coolant temperature sensor and set basic timing to 12~ BTDC +/- 2~ BTDC.
(4) Shut off engine.
(5) Disconnect 3/16" manifold vacuum purge line from the top of the throttle body. Cap the 3/16" throttle body nipple.
(6) Connect Diagnostic Readout Box II (DRBII).
(7) Restart the engine, allow engine to idle for at least one minute.
(8) Using the DRBII, access Min. Airflow Idle Spd. The following will then occur:
- AIS motor will fully close.
- Idle spark advance will become fixed.
- Engine RPM will be displayed on Diagnostic Readout Box II (DRBII).
(9) Check idle RPM with tachometer, if idle RPM is within the below specification then the throttle body min. air flow is set correctly.
Odometer Reading (Below 1000 miles): 600-1100 rpm
(Above 1000 miles): 650-1100 rpm
If idle RPM is not within specification replace throttle body.
(10) Shutoff engine.
(11) Remove DRBII.
(12) Disconnect timing check device and tachometer.
(13) Reconnect purge line to throttle body.
Ignition Timing Procedure Refer to Group 8D "Ignition System."
ON BOARD DIAGNOSTICS (TURBO II ONLY)
The Single Module Engine Controller (SMEC) has been programmed to monitor several different circuits of the fuel injection system. This monitoring is called Onboard Diagnosis. If a problem is sensed with a monitored circuit, often enough to indicate an actual problem, its Fault Code is stored in the SMEC for eventual display to the service technician. If the problem is repaired or ceases to exist, the SMEC cancels the Fault Code after 50 to 100 ignition key on/off cycles.
Front-Wheel-Drive Car Service Manual Publication # 81-270-9003 Revised TSB 18-05-89 April 3, 1989
FAULT CODE DESCRIPTION
When a fault code appears (either by flashes of the check engine lamp or by watching the DRBII, it indicates that the SMEC has recognized an abnormal signal in the system. Fault codes indicate the results of a failure but do not always identify the failed component.
Code 88 - Start oftest
Code 11 - Engine not cranked since battery was disconnected
Code 12 - Memory standby power recently lost
Code 13 - + MAP sensor pneumatic circuit
Code 14 - + MAP sensor electrical circuit
Code 15 - ** Vehicle distance sensor circuit
Code 16 - + Battery voltage sense
Code 17 - Engine running too cool refer to Cooling Group 7.
Code 21 - ** Oxygen sensor circuit
Code 22 - + Coolant temperature sensor circuit
Code 23 - + ** Charge temperature sensor circuit
Code 24 - +Throttle position sensor circuit
Code 25 - ** AIS motor drive circuit
Code 26 - Injector Current Limit Not Achieved
Code 27 - Injector Driver Interface Circuit
Code 31 - ** Canister Purge solenoid circuit
Code 33 - A/C cutout relay circuit
Code 34 - Speed Control Solenoid Driver Circuit
Code 35 - Radiator Fan Relay Control Circuit
Code 36 - + ** Wastegate solenoid circuit
Code 37 - + Barometric read solenoid circuit
Code 41 - Charging system excess or no field current
Code 42 - Auto shutdown relay driver circuit
Code 43 - Ignition Coil Control Circuit
Code 44 - Loss of FJ2 to Logic Board
Code 46 - + Battery voltage too high
Code 47 - Battery voltage too low
Code 51 - ** Lean Condition Indicated
Code 52 - ** Rich Condition Indicated
Code 53 - Internal module problem
Code 54 - Distributor sync pick-up circuit
Code 55 - End of Message
+ Check engine lamp on
** Check engine lamp on (California vehicles)
SYSTEM TESTS
Be sure to apply parking brake and/or block wheels before performing idle check or adjustment, or any engine running tests.
Obtaining Fault Codes
(1) Connect DRBII to the diagnostic connector located in the engine compartment near the driver side strut tower (Fig. 22).
(2) Start the engine if possible, cycle the transmission selector and the A/C switch if applicable. Shut off the engine.
(3) Turn the ignition switch on, off, on, off, on. Within 5 seconds record all the diagnostic codes shown on the DRBII observe the check engine lamp.