Initial Inspection and Diagnostic Overview
Fault MemoryThe fault memory is similar to the 1984-85 5000 Turbo. However, this circuitry has been expanded to now test 13 input and 5 output signals. The diagnostic procedure is now performed in two sections:
^ Input checks
^ Output checks
To test the inputs the vehicle must be driven for a minimum of 5 minutes. During the test drive, both the engine speed and manifold pressure must be briefly raised above 3000 RPM and 1.0 bar. This is to ensure that all necessary information is stored in the fault memory.
Stored vaults will be displayed in sequence or steps. To move the diagnosis procedure to the next step the fuse must again be inserted into the relay for 4 seconds.
The diagnosis procedure will be cancelled if the engine speed is raised above 2000 RPM or the ignition is turned off.
If the car has a no start condition, crank the engine with the starter for at least 5 seconds.
Do not switch the ignition off after driving the car or cranking the engine because this will erase the information stored in the fault memory.
Once the fault memory has been activated and the input signals checked, the output signals can be tested. To do this the ignition must be switched off to erase the fault memory. The output signals can then be checked turning the ignition back on and activating the diagnosis procedure.
Input Diagnosis Procedure
1. If the vehicle starts, test drive the car for a minimum of 5 minutes.
During this test drive:
^ Briefly raise engine speed above 3000 RPM.
^ Ensure that manifold pressure has increased higher than 1.0 bar at least once
^ Accelerate briefly using full throttle
2. If the vehicle does not start, crank the engine with the starter for at least 5 seconds.
NOTE: Do not turn off ignition after road test or starter operation because this will erase the fault memory.
3. With the engine idling or ignition on after cranking with starter, insert spare fuse into fuel pump relay for 4 seconds. Remove fuse and read fault code at indicator light.
4. Make note of fault code and then reinsert fuse into fuel pump relay for 4 seconds to switch procedure to next step.
- Once the faults have been identified and recorded, refer to the Diagnosis Code chart.
- After the fault has been corrected, repeat the test drive and diagnosis procedure to ensure that no other faults exist.
Diagnostic Codes
NOTE: The indicator light in the instrument cluster will flash a four digit code when the diagnosis procedure is activated. This fault code flashing will be repeated until the procedure is cancelled or switched to the next step.
The following is an example of the diagnosis code 2314.
t1 = start signal (beginning of code transmittal)
t2 = pause prior to beginning of code
t3 = code impulse duration
t4 = pause between code impulse
t5 = pause between impulse group
t6 = pause at end of code transmittal and before repeat of code
Input Diagnostic Codes:
