Here's what worked to get incomplete monitors to complete for inspection on our 1998 Protege with 1.5L
Heres what I found, digging through old posts, public library and internet.
Air check Texas mentions idle speed adjustments for 96-97 Mazda Protege
Mentions that base idle engine speed out of spec. will prevent monitors from running. Good tips for other vehicles as well.
At your public library refer to:
Mitchells "Engine Performance Service and Repair 1998 Imported"
It contains idle and timing adjustment procedures, has graphs of the Mazda OBD Drive Cycles.
Other posts on this board indicate to check timing, I did and it was exactly 10deg BTDC. To check timing, set idle first assure TEN and GND are jumpered and check timing. Timing light on crankshaft agreed with timing display on scan tool.
To set base idle speed on 1998 Protege with 1.5L
1.) Warm engine to normal operating temperature.
2.) Shut off engine.
3.) Locate diagnostic connector under hood, on wheel well directly over drivers side tire.
4.) In diagnostic connector jumper the TEN and GND connectors.
Which pins are they you ask? TEN is shown as T below and GND as G below
Here are first rows of pins, dots represent rest of connector rows beneath those of interest which are not illustrated.
xx Tx
Gxxxxxx
xxxxxx
.............
5.) Hookup your scan tool to display engine rpm's in the OBD connector in the driver compartment just over the parking brake.
6.) Restart car.
7.) Adjust the phillips/slotted head screw on the top of the throttle body whose head points directly up. Adjust to 700 rpm. Do not adjust the screw down below that acts like a stop for the throttle cable rotator assembly.
8.) Shut off car, remove TEN and GND connector
Ready for the OBD drive cycles:
Follow cycle 1 and 2 below , shut car off wait 30 sec. and repeat the procedure again so entire thing is repeated twice. Then shutoff car, wait 30 sec and restart to check to see if monitors passed!
All I needed was drive cycle 1 and 2 for EGR, O2Sensor and Catalyst to complete.
Drive cycle 1
Start (car should be warmed up already)
All electrical stuff off.
Assure all diagnostic jumpers are off.
Idle (in park or neutral)
Rev engine to 2500 rpm(1.5L) or 2000rpm (1.8L) for at least 15sec.(in park or neutral)
Rev engine to 4000 rpm for at least 15 sec.(in park or neutral)
Idle for at least 20 sec.
Done
Drive cycle 2
Idle for 3 min.
Accelerate to 55mph in 5th or D for 1 min.
decel to stop
Done
Heres what I found, digging through old posts, public library and internet.
Air check Texas mentions idle speed adjustments for 96-97 Mazda Protege
Mentions that base idle engine speed out of spec. will prevent monitors from running. Good tips for other vehicles as well.
At your public library refer to:
Mitchells "Engine Performance Service and Repair 1998 Imported"
It contains idle and timing adjustment procedures, has graphs of the Mazda OBD Drive Cycles.
Other posts on this board indicate to check timing, I did and it was exactly 10deg BTDC. To check timing, set idle first assure TEN and GND are jumpered and check timing. Timing light on crankshaft agreed with timing display on scan tool.
To set base idle speed on 1998 Protege with 1.5L
1.) Warm engine to normal operating temperature.
2.) Shut off engine.
3.) Locate diagnostic connector under hood, on wheel well directly over drivers side tire.
4.) In diagnostic connector jumper the TEN and GND connectors.
Which pins are they you ask? TEN is shown as T below and GND as G below
Here are first rows of pins, dots represent rest of connector rows beneath those of interest which are not illustrated.
xx Tx
Gxxxxxx
xxxxxx
.............
5.) Hookup your scan tool to display engine rpm's in the OBD connector in the driver compartment just over the parking brake.
6.) Restart car.
7.) Adjust the phillips/slotted head screw on the top of the throttle body whose head points directly up. Adjust to 700 rpm. Do not adjust the screw down below that acts like a stop for the throttle cable rotator assembly.
8.) Shut off car, remove TEN and GND connector
Ready for the OBD drive cycles:
Follow cycle 1 and 2 below , shut car off wait 30 sec. and repeat the procedure again so entire thing is repeated twice. Then shutoff car, wait 30 sec and restart to check to see if monitors passed!
All I needed was drive cycle 1 and 2 for EGR, O2Sensor and Catalyst to complete.
Drive cycle 1
Start (car should be warmed up already)
All electrical stuff off.
Assure all diagnostic jumpers are off.
Idle (in park or neutral)
Rev engine to 2500 rpm(1.5L) or 2000rpm (1.8L) for at least 15sec.(in park or neutral)
Rev engine to 4000 rpm for at least 15 sec.(in park or neutral)
Idle for at least 20 sec.
Done
Drive cycle 2
Idle for 3 min.
Accelerate to 55mph in 5th or D for 1 min.
decel to stop
Done
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