CHECK FOR MOMENTARY
INTERRUPTION
As described in the preceding paragraph, abnormality detection
ability in the test mode is increased compared to that in the normal
mode, so that when momentary interruptions or momentary shorts
occur in the ECM signal circuits (G1, G2, NE, THW, THA, VS, VTA)
shown in the table below, the appropriate diagnostic trouble code
is output.
Accordingly, when the diagnostic trouble codes shown in the table
below (13, 22, 24, 31, 32, 41) are output during the diagnostic
trouble code check, and inspection of the appropriate circuits re-
veals no abnormality, perform the check for momentary interrup-
tion as described below.
By performing the check for momentary interruption, the place
where momentary interruptions or momentary shorts are occur-
ring due to poor contacts can be isolated.
Diag. Code
Circuit
13
RPM signal circuit (No.2)
ÑÑÑ
22
ÑÑÑÑÑÑÑÑ
Engine coolant temp. sensor
circuit
24
Intake air temp. sensor circuit
31⋅32 Volume air flow meter circuit
41 Throttle position sensor circuit
CLEAR DIAGNOSTIC TROUBLE CODES
See page EG–323.
SET TEST MODE
1. With the ignition switch off, using SST, connect the
terminals TE2 and E1 of the Data link connector 2 or 1.
SST 09843–18020
2. Start the engine and check to see the Malfunction
Indicator Lamp to go off.
PERFORM A SIMULATION TEST
Using the symptom simulation (See page IN–20), apply vibration
to and pull lightly on the wire harness, connector or terminals in the
circuit indicated by the malfunction code. In this test, if the Malfunc-
tion Indicator Lamp lights up, it indicates that the place where the
wire harness, connector or terminals being pulled or vibrated has
faulty contact. Check that point for loose connections, dirt on the
terminals, poor fit or other problems and repair as necessary.
HINT: After cancelling out the diagnostic trouble code in memory
and set the test mode, if the Malfunction Indicator Lamp does not
go off after the engine is started, check thoroughly for faulty con-
tact, etc., then try the check again. If the Malfunction Indicator
Lamp still does not go off, check and replace ECM.
–ENGINE TROUBLESHOOTING CHECK FOR MOMENTARY INTERRUPTION
EG–333
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