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

1. Connect diagnostic readout box to engine harness connector and place in Diagnostic Mode.
2. Record all codes. If fault codes 22, 28, 25 or 26 appear at this time proceed to test indication.
3. Turn ignition switch Off, then disconnect the computer 14-way connector for one minute and reconnect it.
4. Disconnect the diagnostic readout box.
5. Start engine and run for two minutes, then turn engine Off.
6. Reconnect the diagnostic readout box.
7. Place the system in Diagnostic mode and record all codes.
8. If codes displayed are the same as those in step 2, proceed to test indications. If code does not reappear after the engine is started, the problem no longer exists but was intermittent. Check for loose or corroded wiring connections in the circuit.
9. Initiate the appropriate diagnosis for the following fault code displays:
a. Code sequence 88-14-55 indicates no fault codes are present. Proceed to Step B.
b. Code sequence 88-11-14-55 or 88-11-14-22-55 indicates a fault in the oxygen sensor circuit. Proceed to Test 2.
c. Code sequence 88-13-14-55 indicates a fault in the air switching solenoid circuit. Proceed to Test 3.
d. Code sequence 88-14-17-55 indicates a fault in the throttle control solenoid. Proceed to Test 4.
e. Code sequence 88-14-18-55 indicates a fault in the EGR system or canister purge control solenoid. Proceed to Test 5.
f. Code sequence 88-14-22-55 indicates a fault in the oxygen feedback system circuit. Proceed to Test 6.
g. Code sequence 88-14-24-55 indicates a fault in the vacuum sensor circuit. Replace computer.
h. Code sequence 88-14-25-55 indicates a fault in the charge temperature circuit. Proceed to Test 7A.
i. Code sequence 88-14-26-55 indicates a fault in the engine temperature circuit. Proceed to Test 7D.
j. Code sequence 88-14-28-55 indicates a fault in the speed sensor circuit. Proceed to Test 8.
k. Code sequence 88-14-32-55, 88-14-33-55 or 88-11-13-14-16-17-18-55 indicates a fault in the computer. Replace computer.
l. Code sequence 88-13-14-18-55 indicates a open circuit in ignition feed wire. Repair open circuit in ignition feed wire to dual solenoids.
m. No code 88 after switch is moved to Hold position indicates a faulty computer. Proceed to Test 9. Ensure diagnostic readout box is operational.
n. No code 00, check diagnostic readout connector ignition and ground wire for open circuits. If okay, repair readout box.