TEST NTC-1ANO TROUBLE CODE TEST MENU
First, check all Technical Service Bulletins that relate to this driveability problem. Perform corrective
actions if indicated; otherwise continue.
1.NO TROUBLE CODE COMPLETE TEST(non-monitored and monitored circuits)
PerformNTC-2AthroughNTC-13Ain sequence until the driveability problem is found.
NO TROUBLE CODE MENU
CHECKING GLOW PLUG OPERATION.........................................NTC-2A
CHECKING FUEL INJECTION PUMP CIRCUITS.................................NTC-3A
CHECKING THE PCM POWER AND GROUND CIRCUITS.........................NTC-4A
CHECKING ENGINE COOLANT SENSOR CALIBRATION..........................NTC-5A
CHECKING ACCELERATOR PEDAL SENSOR CALIBRATION......................NTC-6A
CHECKING BOOST PRESSURE SENSOR CALIBRATION.........................NTC-7A
CHECKING FUEL TEMPERATURE SENSOR CALIBRATION.......................NTC-8A
CHECKING EGR SYSTEM...................................................NTC-9A
CHECKING THE FUEL HEATER.............................................NTC-10A
CHECKING RADIATOR FAN OPERATION.....................................NTC-11A
CHECKING THE ENGINE MECHANICAL SYSTEMS.............................NTC-12A
CHECKING THE TURBOCHARGER..........................................NTC-13A
2.NO TROUBLE CODE QUICK INDIVIDUAL TEST(individual test only)
If you suspect any of the above items to be the cause of the vehicle's driveability problem, perform
the associated test(s) individually.Return to No Trouble Code Menu if driveability problem still
exists, or perform No Trouble Code Complete Test.
3.NO TROUBLE CODE QUICK SYMPTOM TEST(symptom test only)
Symptom checks cannot be used properly unless the driveability problem characteristic actually
happens while the vehicle is being tested. To reduce diagnostic time, ensure that DTC TEST and
appropriate GENERAL INFORMATION sections have been reviewed before attempting to diagnose
a symptom.
Select the symptom that most accurately describes the vehicle's driveability problem and then
perform the test routine that pertains to this symptom. Perform each routine test in sequence until
the problem is found. For definitions, see Section 12.0 in the GENERAL INFORMATION section in
this manual.
NOTE:For all component locations seeGeneral Information Section 4.0in this manual.
N
O
T
R
O
U
B
L
E
C
O
D
E
T
E
S
T
S
322
ProCarManuals.com
TEST NTC-1ANO TROUBLE CODE TEST MENU
SYMPTOM DIAGNOSTIC TEST ROUTINE
HARD START NTC-2A, 3A, 4A, 5A, 6A, 7A, 8A, 10A
START AND STALL NTC-2A, 3A, 4A, 5A, 6A, 7A, 8A, 10A
HESITATION/SAG/STUMBLE NO TROUBLE CODE COMPLETE TEST (STEP 1)
SURGE NTC-3A, 4A, 5A, 6A, 7A, 8A, 9A
LACK OF POWER/SLUGGISH NTC-3A, 4A, 5A, 6A, 7A, 8A, 9A, 10A
PRE-IGNITION/DETONATION NO TROUBLE CODE COMPLETE TEST (STEP 1)
CUTS OUT/MISSES NTC-3A, 4A, 5A, 6A, 7A, 8A, 9A, 11A
BACKFIRE/POPBACK NTC-3A, 4A, 5A, 6A, 7A, 8A, 9A, 11A
RUNS ROUGH/UNSTABLE/ NO TROUBLE CODE COMPLETE TEST
ERRATIC IDLE (STEP 1)
POOR FUEL ECONOMY NO TROUBLE CODE COMPLETE TEST
(STEP 1)
N
O
T
R
O
U
B
L
E
C
O
D
E
T
E
S
T
S
323
ProCarManuals.com
TEST NTC-8ACHECKING FUEL TEMPERATURE SENSOR CALIBRATION
Perform TEST NTC-1A Before Proceeding
*Perform Verification TEST VER-2A. **Check connectors - Clean / repair as necessary.
KEY ON, ENGINE START AND IDLE THE
START TEST OFF. USING THE ENGINE UNTIL
NTC-8A. DRB, MONITOR THE ENGINE TEMPERATURE
ECT SENSOR INPUT. REACHES 70*C
(160*F).
NOTE: IF ENGINE TEMP USING THE DRB, IS THE FUEL
IS ABOVE 70*C READ THE FUEL TEMPERATURE NO REPLACE THE FUEL
(160*F), ALLOW THE TEMPERATURE SENSOR BETWEEN INJECTION PUMP
ENGINE TO COOL DOWN INPUT. 20*C (70*F) AND ASSEMBLY.*
TO 70*C (160*F). 50*C (120*F)?
YES
COMPARE THE ECT START THE ENGINE DOES THE FUEL TEMP
AND FUEL AND ALLOW IT TO SENSOR READING NO REPLACE THE FUEL
TEMPERATURE SENSOR REACH OPERATING INCREASE STEADILY INJECTION PUMP
INPUTS IN THE TEMPERATURE OF TO 38-60*C ASSEMBLY.*
FOLLOWING STEP. 80*C (195*F). (100-140*F)?
YES
FUEL
TEMPERATURE
SENSOR OPERATING
NORMALLY.
TEST PASSED.
N
O
T
R
O
U
B
L
E
C
O
D
E
T
E
S
T
S
339
ProCarManuals.com
TEST NTC-10ACHECKING THE FUEL HEATER AND THE CRANKCASE VENT HEATER
*Perform Verification TEST VER-2A. **Check connectors - Clean / repair as necessary.
TURN IGNITION OFF.
START TEST YES PERFORM TEST
NTC-10A. INSPECT FUSE #16 IS THE FUSE OPEN? NTC-10B.
IN THE PDC.
NO
USING A TEST
REMOVE THE FUEL LIGHT, PROBE RELAY IS THE TEST LIGHT NO REPLACE THE POWER
HEATER RELAY.** CONNECTOR CAVITY ON? DISTRIBUTION
30 (IN PDC). CENTER.*.
FIG. 1
YES
USING A TEST REPAIR THE FUSED
LIGHT, PROBE FUSED IS THE TEST LIGHT NO IGNITION SWITCH
TURN IGNITION ON. IGNITION SW OUTPUT ON? OUTPUT CIRCUIT FOR
CKT (IN PDC). AN OPEN OR SHORT
FIG. 1 TO GROUND.*
YES
WITH IGNITION RELAY CONNECTOR
STILL ON, CONNECT CAVITIES 85 AND 86 IS THE TEST LIGHT NO REPAIR THE OPEN
A TEST LIGHT (IN PDC). ON? RELAY GROUND
ACROSS...CIRCUIT.*
FIG. 1
YES
KEY OFF. DISCONNECT THE
FUEL HEATER AND CONTINUE TEST
INSTALL THE FUEL CRANKCASE VENT TURN IGNITION ON. NTC-10A ON THE
HEATER RELAY. HEATER HARNESS NEXT PAGE.
CONNECTORS.**
N
O
T
R
O
U
B
L
E
C
O
D
E
T
E
S
T
S
343
ProCarManuals.com
