EFI Vitara Diagnostic Trouble Codes

[kimclive]

The following procedure is for early model (1991 to about 1995) EFI 16v Vitaras (G16B)

Beside the relays just in front of the battery in the engine bay is a "Monitor Coupler"

It is a small 4 pin female plug with a rubber cover.

Remove the rubber cover and holding the plug so that the narrower, rounded end is at the top, put a wire from the top right pin (diagnosis switch terminal) to the bottom left pin (ground). See picture.

Switch the ignition to 'ON' but dont start the engine. Watch the "CHECK ENGINE" light and it will flash. It will flash a number of times, one second break, flash again. Count the flashes before and after the pause and you will get a 2 digit number. eg 1 flash, 1 second break, 2 flashes -> 12 -> Normal operation.

DIAGNOSTIC TROUBLE CODES

13 heated oxygen sensor
14 engine coolant temp sensor
15 engine coolant temp sensor
21 throttle position sensor
22 throttle position sensor
23 intake air temperature sensor
24 vehicle speed sensor
25 intake air temperature sensor
33 mass air flow sensor
34 mass air flow sensor
41 ignition fail safe signal
42 camshaft position sensor
44 idle switch of throttle position sensor
45 idle switch of throttle position sensor
51 EGR system
52 Fuel system
53 ECM spec
ON ECM failure
12 Normal state.

RESET

Remove power to ECM for 20 seconds (Remove battery negative terminal)

[kimclive]

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