Procedure A
PROCEDURE A (2002-2005 MY)CHECKING FUEL GAUGE OPERATION:
NOTE
WHEN PERFORMING STEPS 4A-0, FUEL GAUGE SLOSH STRATEGY REQUIRES SPECIFIC KEY ON AND KEY OFF CYCLE TIMES. THESE TIMES MUST BE OBSERVED OR THE DIAGNOSTIC RESULTS WILL NOT BE ACCURATE.
1. Key in OFF position.
2. Remove Fuse F1.15 (15 amp) from the Battery Junction Box, wait 1 minute and reinstall fuse.
NOTE
THIS IS DONE TO RESET THE CLUSTER FUEL GAUGE TIMERS. FAILURE TO COMPLETE THIS STEP MAY RESULT IN ERRONEOUS TEST RESULTS.
3. Disconnect the in-line connector to the fuel pump module (C438 for 4.6L) or (C431 for 4.0L), located on the RH frame rail.
4. On the vehicle harness side of the connector, connect one lead of an instrument gauge system tester (Rotunda # 014-R1063 or equivalent) to Circuit 1356 (LG/VT - Pin-8 in Connector C438 and C431) and the other lead to Circuit 1357 (LB/YE - Pin-5 in C438 for 4.6L or Pin-4 in C431 for 4.0L) (Figure 1).
a. With the key in the RUN position, move the shift lever from PARK to DRIVE, wait 10 seconds and then back to PARK.
b. Wait 30 seconds with the key in the RUN position and the shift lever in PARK.
c. Turn key to the OFF position.
d. Set the tester to 160 ohms.
e. Turn key to the RUN position, move the shift lever from PARK to DRIVE, wait 10 seconds and then move the shift lever back to PARK.
f. Wait 30 seconds with the key in the RUN position and the shift lever in PARK.
g. Turn key to OFF position and wait 30 seconds.
h. Set the tester to 15 ohms.
i. Turn key to RUN position, move the shift lever from PARK to DRIVE, wait 10 seconds and then move the shift lever back to PARK.
j. Wait 30 seconds with the key in the RUN Position and the shift lever in PARK.
NOTE
THE FUEL GAUGE SHOULD READ "E" (EMPTY MARK) OR BELOW WHEN CARRYING OUT THIS TEST STEP.
k. Turn key to OFF position and wait 30 seconds.
l. Set the tester to 160 ohms.
m. Turn key to ON position.
NOTE
THE FUEL GAUGE SHOULD READ "F" (FULL) OR ABOVE WHEN CARRYING OUT THIS TEST STEP.
n. Wait 1 minute for the gauge to respond.
o. Turn key to OFF position. After completing Steps 4A-0, if the fuel gauge operates correctly replace the fuel sender only (9A299). If not, refer to the Workshop Manual, Section 413-01 and perform normal diagnostics.