| Code |
Code
Possible Fault (From most likely to least likely) |
| 13 |
Check wiring and connectors.
Bad Sensor |
| 14 |
Check wiring, connectors,
thermostat. Monitor actual engine temperature. If within
limits, and wiring/connector is OK, change thermostat
and/or sensor. |
| 15 |
See above, particularly
thermostat |
| 16 |
Direct Ignition (DI) Fault |
| 21 |
Sticking or Misadjusted
TPS. Also check wiring and /connectors. Adjust or replace
TPS. |
| 22 |
Sticking or Misadjusted
TPS. Also check wiring and /connectors. Adjust or replace
TPS. |
| 23 |
Measure sensor resistance
with Digital Ohm meter. Must not be 0 ohms or infinite
ohms. Replace if it shows one of these readings. Check
wiring/connector of sensor. If OK, replace sensor. |
| 24 |
Only valid if vehicle
moving. Check connections at ECM Check TPS setting. Possible
ECM failure. |
| 25 |
Measure sensor resistance
with Digital Ohm meter. Must not be 0 ohms or infinite
ohms. Replace if it shows one of these readings. Check
wiring.connector of sensor OK. |
| 26 |
Check EGR, Canister Purge
and AIR pump relays with a digital Ohm meter. A resistance
of less than 18 ohms indicates a bad relay. If OK, potential
ECM failure. |
| 27 |
Potential ECM or on a
manual transmission car, potential upshift relay problem.
Check relay, replace if less than 18 Ohms using a digital
Ohm Meter. |
| 28 |
Air conditioning Clutch
relay and/or cooling fan relays. Check with digital Ohm
meter, replace if less than 18 Ohms. If relays OK, potential
ECM failure. |
| 32 |
The most common cause
of this code is a bad or intermittent EGR switch which
is located on the EGR pipe between the exhaust manifold
and the intake manifold. Replace this switch first when
you get this code. Next, check electrical connections
at EGR valve solenoid and then the ECM. Check all vacuum
lines for leaks especially around the EGR valve. Possible
ECM failure. |
| 33 |
(1985-1990) Inspect intake
system for leaks, Inspect for vacuum leaks, Check MAF
connector and wiring, Check MAF for open using digital
Ohm meter. Possible ECM failure. |
| 33 |
(1984) Check vacuum hoses.
Check wiring to sensor. Change sensor. Check connections
at ECM. |
