ON BOARD DIAGNOSTIC SYSTEM
F2-93flowchartMTX (manual) vs ATX (automatic) transaxle distinctions for neutral/clutch vs transaxle range switch diagnostics. References '94 and '95 MX-3 BETM (Body Electrical Troubleshooting Manual).
Procedure
1
Set conditions to deactivate each switch: All accessories OFF; Transaxle in neutral; All pedals released. Does monitor light fail to illuminate?
NO
Check each switch and related wire harness: Clutch and neutral switch (MTX) (page F2-157); Transaxle range switch (section K); Closed throttle position switch (page F2-151); Brake switch ('95 MX-3 BETM); Headlight switch ('95 MX-3 BETM); Rear window defroster switch ('95 MX-3 BETM); Blower switch ('95 MX-3 BETM); A/C switch ('95 MX-3 BETM); Fog light switch ('95 MX-3 BETM)
Check each switch and related wire harness: Clutch and neutral switch (MTX) (page F2-157); Transaxle range switch (section K); Closed throttle position switch (page F2-151); Brake switch ('95 MX-3 BETM); Headlight switch ('95 MX-3 BETM); Rear window defroster switch ('95 MX-3 BETM); Blower switch ('95 MX-3 BETM); A/C switch ('95 MX-3 BETM); Fog light switch ('95 MX-3 BETM)
YES
2
Check each switch as described
Neutral and Clutch switches (MTX)
1
Shift transaxle into gear. Does monitor light illuminate with clutch pedal released?
NO
PC: Neutral switch malfunction (page F2-158); Clutch switch malfunction (page F2-157); Open circuit in related wire harness; ECM terminal 1R voltage incorrect (page F2-141); ECM malfunction
PC: Neutral switch malfunction (page F2-158); Clutch switch malfunction (page F2-157); Open circuit in related wire harness; ECM terminal 1R voltage incorrect (page F2-141); ECM malfunction
YES
2
Depress clutch pedal. Does monitor light fail to illuminate? Return transmission to neutral
NO
3
PC: Clutch switch malfunction (page F2-157)
Transaxle range switch (ATX)
1
Shift transaxle into except P and N range. Does monitor light illuminate?
NO
Transaxle range switch malfunction (Refer to section K); Open or short circuit in related wire harness; ECM terminal 1R malfunction (Refer to page F2-141)
YES
2
Transaxle range switch OK. Shift into P or N range
Closed throttle position switch (In throttle position sensor)
1
Depress accelerator pedal. Does monitor light illuminate?
NO
Closed throttle position switch malfunction (Refer to page F2-151); Open or short circuit in wire harness from throttle position sensor to ECM; ECM terminal 1T or 2I voltage incorrect (Refer to page F2-141)
Closed throttle position switch malfunction (Refer to page F2-151); Open or short circuit in wire harness from throttle position sensor to ECM; ECM terminal 1T or 2I voltage incorrect (Refer to page F2-141)
YES
2
Closed throttle position switch OK. Release accelerator pedal
Brake switch
1
Depress brake pedal. Does monitor light illuminate?
NO
PC: Brake switch malfunction ('94 MX-3 BETM); Open circuit in wire harness from brake switch to ECM; ECM terminal 1Q voltage incorrect (page F2-141); ECM malfunction
PC: Brake switch malfunction ('94 MX-3 BETM); Open circuit in wire harness from brake switch to ECM; ECM terminal 1Q voltage incorrect (page F2-141); ECM malfunction
YES
2
Brake switch OK. Release brake pedal