Check if there is fuel in fuel filter .. ? is the CEL/MIL on (check engine light) if yes we can try to retrieve codes using MIL or Voltmeter ??
DTCs are retrieved from EEC-IV system through Data Link Connector (DLC). Various methods and test equipment may be used to access these DTCs:
Analog Volt-Ohmmeter (VOM).
In-Dash Malfunction Indicator Light (MIL)/CHECK ENGINE light.
DATA LINK CONNECTOR (DLC) LOCATIONS
PickupLeft Rear Of Engine Compartment, On Bracket
KOEO & KOER SELF-TEST DTCs
All DTCs are 3-digit numbers. PCM outputs DTCs one digit at a time. These DTCs indicate current faults in system and should be serviced in order of appearance. Go to DIAGNOSTIC TROUBLE CODE IDENTIFICATION to find correct PINPOINT TESTS.
DTCs are shown as voltage pulses. If using MIL/CHECK ENGINE light, DTCs are displayed as light pulses. If using Volt-Ohmmeter (VOM), DTCs are displayed as needle sweeps. See Fig. 1 .
Pay careful attention to length of pauses in order to read DTCs correctly. A 1/2-second pause occurs between number of sweeps in a digit and a 2-second pause occurs between digits in a DTC. A 4-second pause occurs between each DTC. KOEO DTCs are separated from Continuous Memory Codes by a 6-second delay, a single 1/2-second sweep (Separator) and another 6-second delay. Record DTCs in order received.
Scan tool, if used, will count pulses and display them as a digital code. Star Series Tester will add a zero (0) to single-digit Separator Code (10) and Dynamic Response Code (10). Dynamic Response Code is displayed in KOER SELF-TEST. See Fig. 1 .
Single 1/2-second separator pulse is issued 6-9 seconds after last KOEO DTC. Continuous Memory Codes (soft faults) are then displayed 6-9 seconds after 1/2-second separator code. Some digital test equipment may display separator code as "10" instead of "1".
Code 111 indicates system passes that portion of test. If Code 111 is not retrieved in KOEO SELF-TEST, DTCs retrieved during KOER SELF-TEST may not be valid. DTC 111-1-111, output during KOEO SELF-TEST, indicates no KOEO DTC or Continuous Memory Code was recorded.
Continuous Memory DTCs
Continuous Memory DTCs are displayed after separator pulse code in KOEO SELF-TEST. These DTCs result from information stored by PCM during continuous self-test monitoring. These DTCs indicate faults recorded within last 40 engine starts (80 engine starts on some models). Fault may or may not be currently present. Go to DIAGNOSTIC TROUBLE CODE IDENTIFICATION . Use these DTCs for diagnosis only when KOEO SELF-TEST and KOER SELF-TEST result in DTC 111.
At start of KOEO SELF-TEST and after Wide Open Throttle (WOT) request in KOER SELF-TEST, PCM outputs short bursts of information, known as FAST CODES, which were used by manufacturer during assembly. With most equipment, these code bursts are not visible; an entire DTC sequence lasts less than 1/2 second. If this fluctuation is visible on test equipment, ignore it.
Tuesday, December 16th, 2008 AT 9:55 PM