3-40 ENGINE CONTROL SYSTEM
NOTE:
• If more than two items fail at once, the self-diagnostic indication appears according to priority order. The
indication repeats three times.
• If the failed item remains, the self-diagnostic indication appears again after turning the ignition switch
“ON”.
• After correcting failed item, the self-diagnostic indication appears until the ECM receives the proper signal
with the engine running.
• For cylinder temp. sensor, exhaust manifold temp. sensor or IAT sensor the self-diagnostic indication will
be canceled after corrective action by turning the ignition switch “ON”.
(The ECM will require 10 – 20 seconds after turning the ignition switch “ON” to cancel the self-diagnostic
indication.)
NOTE 1:
To cancel the diagnostic display of CKP sensor, perform the following procedures after the failure has been
corrected:
(1) Start the engine. The diagnostic code for CKP sensor failure will continue to be displayed until a normal
signal sequence is received by the ECM. Thereafter only the display being conceled. At this stage of the
diagnostic system reset process the diagnostic code for a failed CKP sensor is not displayed but the
engine is still controlled using the CMP sensor signal.
(2) Stop the engine and restart. At the second restart, complete canceling of the CKP sensor failure code
will occur.
NOTE 2:
This self-diagnostic indication may not display (be canceled) by turning the ignition switch “ON” because the
ECM detects only battery voltage, not charging output. Under this condition the buzzer will not sound a 1-1
code.
However, if the rectifier & regulator have failed, the self diagnostic indication will again appear after starting
the engine.
NOTE 3:
The diagnostic code for model discrimination is displayed when a failure (either open or short circuit) exists
in No.13 terminal of the wiring harness connector.
When this code is displayed, the first check should be for a failure in the wiring harness.
When this code is displayed, do not replace the ECM.
Replacing the ECM may cause improper execution of the self-diagnostic for model discrimination possibly
leading to engine trouble.
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