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90-91 3.1L VIN V MFI
13	Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds when the TPS signal was above 4%. The engine had been running for at least 2 minutes.
14	Coolant temperature sensor signal indicates a temperature of over 275° F for 3 seconds.
15	Coolant temperature sensor signal indicates a temperature colder than -38° F for at least 20 seconds.
21	TPS voltage was above 4.3 volts for 10 seconds when engine was running and air flow was less than 17 gm/sec.
22	TPS voltage was under 0.25 volts for 4 seconds when the ignition was on.
23	Manifold air temperature sensor signal showed an air temperature of -31° F for 10 seconds after engine had been running for 4 minutes.
24	Engine speed was between 2200 and 4400 RPM and transmission was not in park or neutral and TPS was less than 2% for 3 seconds.
25	Manifold air temperature sensor signal showed an air temperature over 293° F for 3 seconds when vehicle speed was greater than 3 MPH and engine had been running for 8 minutes.
26	Quad-driver sense voltage showed a low voltage when battery voltage should be present, or the sense voltage showed battery voltage when a low voltage should be present.
32	The ECM opens each EGR control valve during deceleration and monitors the change in manifold vacuum. The code sets when the change in manifold vacuum is outside the normal range.
33	MAP sensor voltage was too high for 4.8 seconds when throttle angle was less than 2%.
34	MAP sensor voltage was too low for 1 second when engine speed was under 600 RPM, or MAP sensor voltage was too low for 1 second when engine speed was over 600 RPM and throttle angle was above 20%.
35	Engine idle speed is either 300 RPM above or below the desired idle speed for 50 seconds.
41	Faulty or incorrect MEM-CAL.
42	The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43	Knock sensor signal was either above 3.5 volts or below 1.5 volts for at least 0.5 seconds.
44	Oxygen sensor voltage was under 0.2 volts for at least 60 seconds of closed loop operation.
45	Oxygen sensor voltage was over 0.7 volts for 50 seconds in closed loop operation with a throttle angle between 3% and 45%.
51	MEM-CAL error.
52	CALPAK error.
53	ECM sees a battery voltage of more than 17.1 volts for 2 seconds.
54	Fuel pump voltage was less than 4 volts for 0.4 seconds.
62	Vehicle gear commanded by ECM did not match actual gear selected.
66	A/C pressure sensor voltage was either above 4.9 volts or below 0.1 volts for at least 5 seconds.

90-91 3.1L VIN V MFI

Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds when the TPS signal was above 4%. The engine had been running for at least 2 minutes.

Coolant temperature sensor signal indicates a temperature of over 275° F for 3 seconds.

Coolant temperature sensor signal indicates a temperature colder than -38° F for at least 20 seconds.

TPS voltage was above 4.3 volts for 10 seconds when engine was running and air flow was less than 17 gm/sec.

TPS voltage was under 0.25 volts for 4 seconds when the ignition was on.

Manifold air temperature sensor signal showed an air temperature of -31° F for 10 seconds after engine had been running for 4 minutes.

Engine speed was between 2200 and 4400 RPM and transmission was not in park or neutral and TPS was less than 2% for 3 seconds.

Manifold air temperature sensor signal showed an air temperature over 293° F for 3 seconds when vehicle speed was greater than 3 MPH and engine had been running for 8 minutes.

Quad-driver sense voltage showed a low voltage when battery voltage should be present, or the sense voltage showed battery voltage when a low voltage should be present.

The ECM opens each EGR control valve during deceleration and monitors the change in manifold vacuum. The code sets when the change in manifold vacuum is outside the normal range.

MAP sensor voltage was too high for 4.8 seconds when throttle angle was less than 2%.

MAP sensor voltage was too low for 1 second when engine speed was under 600 RPM, or MAP sensor voltage was too low for 1 second when engine speed was over 600 RPM and throttle angle was above 20%.

Engine idle speed is either 300 RPM above or below the desired idle speed for 50 seconds.

Faulty or incorrect MEM-CAL.

The EST signal did not change when the ECM applied bypass voltage to the ignition module.

Knock sensor signal was either above 3.5 volts or below 1.5 volts for at least 0.5 seconds.

Oxygen sensor voltage was under 0.2 volts for at least 60 seconds of closed loop operation.

Oxygen sensor voltage was over 0.7 volts for 50 seconds in closed loop operation with a throttle angle between 3% and 45%.

MEM-CAL error.

CALPAK error.

ECM sees a battery voltage of more than 17.1 volts for 2 seconds.

Fuel pump voltage was less than 4 volts for 0.4 seconds.

Vehicle gear commanded by ECM did not match actual gear selected.

A/C pressure sensor voltage was either above 4.9 volts or below 0.1 volts for at least 5 seconds.

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