Mil/TCIL Never On And Mil/TCIL Always On

DETECTION CONDITION AND POSSIBLE CAUSE

13	MIL/TCIL NEVER ON MIL/TCIL ALWAYS ON
DESCRIPTION	Malfunction indicator lamp (MIL) never on Transmission control indicator lamp (TCIL) never on Malfunction indicator lamp (MIL) always on Transmission control indicator lamp (TCIL) always on

MIL/TCIL NEVER ON AND MIL/TCIL ALWAYS ON INSPECTION

STEP	INSPECTION		ACTION
1	WHICH WARNING INDICATOR IS CONCERN ASSOCIATED WITH? Is the symptom associated with the MIL or TCIL warning lamps?	Yes	Go to step 2.
1		No	Service as required, See INSTRUMENT PANELS article in Accessories & Equipment
2	PRELIMINARY CHECKS Perform the following preliminary checks: Electrical connections. System components relating to warning indicator. Verify fuel filler cap is properly tightened. Are all checks OK?	Yes	Go to step 3.
2		No	Service as required. After repair, if no other symptoms are present, Rerun Quick Test. See ON-BOARD DIAGNOSTIC TESTS .
3	CHECK SYSTEM INDICATOR LAMPS Is the symptom "TCIL never on" or "MIL never on" (this includes MIL never on during bulb check when the engine is first started)?	Yes	For TCIL Never On: See TRANSMISSION CONTROL SWITCH (TCS) OR TRANSMISSION CONTROL INDICATOR LAMP (TCIL) CIRCUIT MALFUNCTION , step 8. For MIL Never On: See TEST 3: MALFUNCTION INDICATOR LAMP (MIL) , step 2.
3		No	Go to step 4.
4	CHECK ENGINE OPERATION Does engine start?	Yes	Go to step 5.
4	CHECK ENGINE OPERATION Does engine start?	No	See DIAGNOSTIC INDEX .
5	CHECK ENGINE IDLE IN PARK OR NEUTRAL Does engine idle rough in Park or Neutral?	Yes	See ENGINE POOR DRIVEABILITY .
5		No	Go to step 6.
6	PERFORM PCM QUICK TEST Are any DTCs displayed during Continuous Memory Self Tests, Key ON, Engine OFF (KOEO) or Key ON, Engine Running (KOER) or ?	Yes	Check for cause. See DIAGNOSTIC TROUBLE CODE NUMBERS .
6		No	Go to step 8.
7	CHECK SYMPTOM INDICATOR WITH THE ENGINE RUNNING Is the MIL or TCIL always on with the engine running?	Yes	For MIL always on: See TEST 3: MALFUNCTION INDICATOR LAMP (MIL) . For TCIL always on: TRANSMISSION CONTROL SWITCH (TCS) OR TRANSMISSION CONTROL INDICATOR LAMP (TCIL) CIRCUIT MALFUNCTION , step 6.
7		No	Go to step 8.
8	Verify test results. If OK, See DIAGNOSTIC INDEX to service any additional symptoms