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

1. Connect diagnostic read-out tool to engine harness connector.
2. Within five seconds, cycle ignition on and off two times, then turn on and record all codes. If code sequence is 15-17-21-51 or 52, proceed to step 9. DR-9A Fault Code 31 EGR/Canister Purge Solenoid
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 same as those in step 2, proceed to step 9. DR-9A Fault Code 31 EGR/Canister Purge SolenoidIf codes are not repeated, proceed to Test 1 step Q DR-1Q Intermittent Caused By Wiring &/or Connectors
9. Initiate 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 DR-1B Output Circuits of ECM Controlled Components
b. Code sequence 88-12-13-55, 88-12-14-55 or 88-12-13-14-55 indicates a fault in MAP sensor circuit. Proceed to Test 2 DR-2A Fault Codes 13 &/or 14 MAP Sensor Circuit
c. Code sequence 88-12-15-55 indicates a fault in speed sensor circuit. Proceed to Test 3 DR-3A Fault Code 15 Speed Sensor Circuit
d. Code sequence 88-12-17-55 indicates engine is running to cool. Check engine for possible bad thermostat.
e. Code sequence 88-12-21-55 indicates a fault in oxygen sensor circuit. Proceed to Test 4 DR-4A Fault Code 21-Oxygen Sensor Circuit
f. Code sequence 88-12-22-55 or 88-12-17-22-55 indicates a fault in engine coolant sensor circuit. Proceed to Test 5 DR-5A Fault Code 22-Coolant Sensor Circuit
g. Code sequence 88-12-23-55 indicates a fault in charge temperature sensor circuit. Proceed to Test 6 DR-6A Fault Code 23 Charge Temperature Sensor
h. Code sequence 88-12-24-55 indicates a fault in throttle position sensor circuit. Proceed to Test 7 DR-7A Fault Code 24 Throttle Position Sensor Circuit
i. Code sequence 88-12-25-55 indicates a fault in idle motor circuit. On models equipped with Turbo I proceed to Test 8A, on models equipped with Turbo II proceed to Test 8C DR-8C Fault Code 25 AIS Motor Circuit Turbo II
j. Code sequence 88-12-31-55 indicates a fault in EGR/Canister purge solenoid circuit. Proceed to Test 9 DR-9A Fault Code 31 EGR/Canister Purge Solenoid
k. Code sequence 88-12-33-55 indicates a fault in A/C cutout relay. Proceed to Test 10 DR-10A Fault Code 33 A/C Cutout Relay
l. Code sequence 88-12-35-55 indicates a fault in radiator fan relay. Proceed to Test 11 DR-11A Fault Code 35 Radiator Fan Relay
m. Code sequence 88-12-36-55 or 88-12-36-45-55 indicates a fault in wastegate solenoid. Proceed to Test 12 DR-12A Fault Code 36/36-45 Wastegate Solenoid
n. Code sequence 88-12-37-55 indicates a fault in baro read solenoid. Proceed to Test 13 DR-13A Fault Code 37 BARO Read Solenoid Circuit
o. Code sequence 88-12-45-55 indicates a fault in overboost shutoff circuit. Proceed to Test 14 DR-14A Fault Code 45 Overboost Shutoff
p. Code sequence 88-12-51-55 or 88-12-52-55 indicates a fault in oxygen sensor circuit. Proceed to Test 18 DR-18A Engine Coolant Temperature Sensor
q. Code sequence 88-12-31-37-55, check for open circuit in ignition switch voltage supply wire to solenoid.
r. Code sequence 88-12-53-55, replace logic module.
s. No Code 88 indicates a fault in logic module memory standby circuit. Locate and repair open circuit in battery feed wire of cavity 2 in blue module connector.