Code
O= KOEO
R= KOER
M= memory, continuous
24..Intake Air Temperature/Air Charge Temperature Sensor Out Of Self Test Range. 0.3 volts (250°F) to 3.7 volts (50°F)(O,R)
A code 24 is normal to get logged if a KOEO self test is performed with a cold engine or air temp is below 50°F. A code 24 is also normal to get logged if a KOER self test is performed with the air temp below ~100°F.
31.. EGR Valve Position/Pressure Feedback EGR Circuit Below Minimum Voltage. 0.24 volts (O,M,R)
Disconnect EVP sensor and install jumper wire between the EVP and VREF terminals.... run a KOEO.
Code 31 should not show as an OD type code and should be replaced by code 34 and/or 35.
67.. Park Neutral Position Switch Circuit Open; A/C On -Manual (O), Manual Lever Position Sensor Out Of Range/A/C On (M,O), Clutch Switch Circuit Failure (M)
Was the transmission in gear when the KOEO was run?...... if so, repeat the KOEO with the trans in neutral.... if it was in neutral, repeat the KOEO while you press the clutch pedal and hold it down for the duration of KOEO self-test.
1. Make sure pin 30 sees a ground condition when you press the clutch pedal or the transmission is in-neutral. You can temporarily splice into pin 30 wire and install a jumper wire to a ground at the frame to check if code 67 disappears..... if not.....
2. Check pin 10 at the ECM connector (ACCS signal) with a DVOM for 12-vdc IGN ON, if 12 vdc are present, need to trace that wire for a short to power.....
81.. Secondary Air Diverter Circuit Failure (O)
TAD solenoid circuit is open, if you're not using the AIR pump...... all you need to install in the solenoid connector is a 75 ohm 3watt resistor
82.. Secondary Air Bypass Circuit Failure (O)
84.. EGR Vacuum Regulator (EVR) Control Circuit Failure (O)
85.. CANP Circuit Failure (O)
Is what vents the gas tank from the fuel vapors accumulated by its "breathing".
33, 81, 82, 84, 85, 44 & 94 are what's called “Soft-Codes” which do not effect the
engines fuel / spark programming. Soft-Codes harmlessly stay dormant in the
computer. They're only purpose is to help you repair those systems back to
original factory specs. Soft Codes will not turn on the Check Engine Light.
There is a resistor pack already built into the harness for the EGR Valve Position
Sensor. No other resistors are required.
Codes 33, 81, 82, 84, 85, are normal when the smog solenoids CANP, EGR, TAB & TAD are deleted.