DR-1A CODE to DR TEST Chart (Checking for Fault Codes)

1. Connect diagnostic read-out tool to engine harness connector.
2. Within 5 seconds, cycle ignition on and off two times, then turn on and record all codes. If code sequence is 15-21-47-51 or 52, proceed to step 9.
3. Turn ignition switch Off, then disconnect and reconnect battery connector.
4. Start engine and let run for two minutes. Do not depress accelerator to start engine.
5. Raise engine speed to 2000 RPM for 10 seconds, then return to idle.
6. On models with automatic transmission, cycle gear selector, then turn A/C on and off, if equipped.
7. Turn engine off, then within five seconds, cycle ignition on and off two times, then turn on and record all codes.
8. If codes displayed are the same as those in step 2, proceed to step 9. If codes are not repeated, proceed to Test 1 step K.
9. Initiate the appropriate diagnosis for the following fault code displays:
a. Code sequence 88-12-55 indicates no fault codes are present. Proceed to Test 1 step B.
b. Code sequence 88-12-13-55, 88-12-14-55 or 88-12-13-14-55 indicates a fault in the MAP sensor circuit. Proceed to Test 2.
c. Code sequence 88-12-15-55 indicates a fault in the speed sensor circuit. Proceed 1to Test 3.
d. Code sequence 88-12-16-55 indicates a fault in the battery voltage for charging system. Proceed to Test 4.
e. Code sequence 88-12-17-55 indicates engine is running to cool. Check engine for possible bad thermostat.
f. Code sequence 88-12-21-55 indicates a fault in the oxygen sensor circuit. Proceed to Test 5.
g. Code sequence 88-12-22-55 or 88-12-17-22-55 indicates a fault in the engine coolant sensor circuit. Proceed to Test 6.
h. Code sequence 88-12-23-55 indicates a fault in the charge temperature sensor circuit. Proceed to Test 7.
i. Code sequence 88-12-24-55 indicates a fault in the throttle position sensor circuit. Proceed to Test 8.
j. Code sequence 88-12-25-55 indicates a fault in the idle motor circuit. Proceed to Test 9.
k. Code sequence 88-12-31-55 indicates a fault in the canister purge solenoid circuit. Proceed to Test 10.
l. Code sequence 88-12-33-55 indicates a fault in the A/C cutout relay. Proceed to Test 11.
m. Code sequence 88-12-34-55 indicates a fault in the EGR solenoid. Proceed to Test 12.
n. Code sequence 88-12-35-55 indicates a fault in the radiator fan relay. Proceed to Test 13.
o. Code sequence 88-12-36-55 or 88-12-36-45-55 indicates a fault in the wastegate solenoid. Proceed to Test 14.
p. Code sequence 88-12-37-55 indicates a fault in the baro read solenoid. Proceed to Test 15.
q. Code sequence 88-12-41-46-55 or 88-12-46-55 indicates charging system output too high. Proceed to Test 16.
r. Code sequence 88-12-41-55 or 88-12-41-47-55 indicates charging system output too low. Proceed to Test 17.
s. Code sequence 88-12-44-55 indicates a fault in battery temperature sensor. Proceed to Test 18.
t. Code sequence 88-12-45-55 indicates a fault in the overboost shutoff circuit. Proceed to Test 19.
u. Code sequence 88-12-51-55 indicates a fault in the oxygen feed back system locked lean. Proceed to Test 26.
v. Code sequence 88-12-52-55 or 88-12-31-34-36-37-55, oxygen feed back system locked rich. check for open circuit between solenoid and ignition switch.
w. Code sequence 88-12-53-55, replace logic module.
x. Code sequence 88-12-47-55 indicates a fault in alternator output. Check drive belt, battery and alternator for cause.
y. No Code 88 indicates a fault in the logic module memory standby circuit. Locate and repair open circuit in battery feed wire of cavity 2 in blue module connector.