After jumping the CCCS I received a Code 33 and Code 36 which would explain why my service engine soon light would't go off. After replacing the relays and MAF sensor(boy was that expensive!) the light went off and I thought I had solved the problem. Unfortunately after the car has been running about 10 minutes and heats up the light comes back on. If I stop the car and restart it it will go off but then come back on again after 10 minutes like clockwork. Sometimes it goes off on its' own when the car is running but itwill eventually light up again after some time. So I'm back to square one tring to figure this out! Does anyone have some experience with Codes 33 and 36 that might be able to point me in the right direction? Thanks as always! Mike

After replacing the relays and MAF, are you still getting BOTH the 33 and 36?

Have you checked/set the TPS voltage recently?

It might also be good to check the grounds at the engine, ECM, and wiring at teh oil pressure switch. Read through the diagnosis for a code 36, and it may point you toward some ideas.

Code 33 Tests

First check air ducts for cracks, holes and tighten clamps.

With the ignition off, unplug the MAF and apply power to ALDL terminal "G". Check the red wire on the MAF connector for power. If no power, verify 12VDC on relay connector orange and white/tan wires. Verify the connector black/white wire is grounded. Verify black wire from MAF
connector terminal B to ECM connector A11 with an ohm meter. Verify red wire from relay connector to MAF connector with an ohm meter. If all is good replace MAF power relay.

Turn ignition on, Check MAF connector dark blue wire for 12VDC, if so, unplug MAF burn off relay and check again. If so, check relay connector black wire for ground. If so, the black wire is shorted to ground or the ECM is bad. If not, replace MAF burn off relay.

If the dark blue wire at the start of the above test had no voltage, check the MAF connector dark green wire with ignition on for a 5VDC reference signal. If so, and all connectors are good, replace MAF. If no 5VDC reference on dark green wire, verify it from the MAF connector to ECM connector B12 with an ohm meter. If the wire is good replace the ECM. If the dark green wire has 12VDC on it, turn ignition off and unplug the ECM connectors. Turn ignition back on and check again, if so, it is shorted to power somewhere. If not, and all connectors and grounds are good replace ECM.

This test can also help diagnose a code 34.


Code 36 Tests

Clear codes.
Ground diagnostics terminal.
Start engine and wait for the check engine light.
Unground terminal.
Shut off car.
Wait a minute or so.
Restart car for 20 seconds or until check engine light comes on.
Shut off car.
Turn ignition to ON position
Check for codes.
No code, problem intermittent.
Code 36, unplug burnoff relay, check both orange wires for power.
If one or both have no power, repair open circuit.
If both orange wires have power, reconnect relay.
Disconnect MAF sensor.
Ground burnoff relay black wire, terminal "F".
Check MAF connector terminal "D" for power.
If no power, replace burn off relay.
If it has power, with relay terminal "F" still grounded, check MAF plug terminal "E".
If no power, replace MAF power relay.
If terminal "E" has power, disconnect burn off relay.
Check burnoff relay black wire (terminal "F") for power. If it has power it is shorted to power somewhere. If it has no power, suspect ECM or ECM connector.
Code 36 can be caused by a bad connection at either relay.
Check relay connector contacts for corrosion and tight fit before replacing ECM.

I know it's a late reply, but after 10 yrs. with a code 33 (and numerous books, flow charts, tests etc.) your post helped me figure it out in less than an hour.
You rock Vader! Thanks.
P.S. It was the wiring going to the burn-off relay.