Gear JEEP CHEROKEE 1988 Service Owner's Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
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park/neutral or gear select switch.
Fig. 6: TCM Connector Terminals I.D., Circuits & Functions
Courtesy of Chrysler Corp.
TEST 1A - VERIFICATION OF THE COMPLAINT
NOTE: ALWAYS start diagnosis with the most recent code.
1) Begin your testing of the transmission with a thorough
visual inspection.
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2) Connect the DRB-II to the transmission diagnostic
connector. See RETRIEVING FAULT CODES under SELF-DIAGNOSTIC SYSTEM for
diagnostic connector location.
CAUTION: If the vehicle is in 3rd or OD position and feels like it
is stuck in 3rd or jumping from 2-1 or 3-1, perform
TEST 10A - TESTING FOR INTERMITTENT SPEED SENSOR test below.
3) With the DRB-II, perform SYSTEM TEST. See SYSTEM TEST MODE
under DRB-II OPERATING MODES .
4) The DRB-II will instruct you to do some actions during the
System Test. The DRB-II will then look for the action to happen and
automatically go to the next test function. If you perform the
required action and the DRB-II does not move to the next function,
press ENTER. The DRB-II will continue the testing.
5) When the DRB-II states "VEHICLE DRIVE", the vehicle be
must be driven at a speed above 4 miles per hour to ensure accurate
testing of the vehicle speed sensor. Afterwards, the DRB-II will
display any fault codes that may be present.
6) When the system test is complete, if there are any fault
codes present, the DRB-II will automatically display the code(s).
7) There are two types of faults for the transmission
solenoids. They are displayed as "FAULT STORED" and "FAULT PRESENT".
Note that the tests are different in the chart below.
8) Perform the tests shown below in response to the indicated
fault codes.
NOTE: ALWAYS start diagnosis with the most recent code.
CODE-TO-TEST MENU
CODE-TO-TEST MENU \
\
\
\
\
\
Code: Solenoid Affected: Fault Status: Perform:
\b \
\
\
\b \
\b \
None None Affected No Faults Test 2A
\b \
\
\
\b \
\b \
700 Solenoid No. 1 Fault Present Test 4A
\b \
\
\
\b \
\b \
700 Solenoid No. 1 Fault Stored Test 3A
\b \
\
\
\b \
\b \
700 Solenoid No. 2 Fault Present Test 4B
\b \
\
\
\b \
\b \
700 Solenoid No. 2 Fault Stored Test 3A
\b \
\
\
\b \
\b \
700 Solenoid No. 3 Fault Present Test 4C
\b \
\
\
\b \
\b \
700 Solenoid No. 3 Fault Stored Test 3A
\b \
\
\
\b \
\b \
702 Speed Sensor Fault Test 5A
\b \
\
\
\b \
\b \
703 Gear Select Fault Test 6A
\b \
\
\
\b \
\b \
705 TPS Fault Test 7A
\b \
\
\
\b \
\b \
708 Wrong TCU Test 9A
\
\
\
\
\
\
\f
TEST 2A - VERIFICATION TEST
NOTE: Perform TEST 1A - VERIFICATION OF THE COMPLAINT
before proceeding.
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This test verifies the correct operation of the AW4
transmission. It must be performed after finding no faults using the
DRB-II, and after a vehicle repair has been made.
1) Turn ignition key to "OFF".
2) Hold the MODE key and press the ATM key on the DRB-II at
the same time to restart the DRB-II.
3) Turn ignition key to "ON".
4) Reconnect all previously disconnected connectors.
5) Verify that the AW4 transmission control unit is properly
mounted.
6) Make sure the transmission fluid is at the proper level.
Check the fluid with the transmission temperature hot, the vehicle on
level ground, and the gear selector in neutral.
7) If any repairs have been made, test the vehicle as
instructed in TEST 1A - VERIFICATION OF THE COMPLAINT , and read faults
using the DRB-II. If there are any fault messages present, repeat TEST
1A - VERIFICATION OF THE COMPLAINT.
TEST 3A - STORED DIAGNOSTIC TROUBLE CODES TEST
NOTE: Perform TEST 1A - VERIFICATION OF THE COMPLAINT
before proceeding.
1) At this point, the Visual Inspection has been performed, a
"FAULT STORED" code has been found and the vehicle has been test
driven. The fault code is not "FAULT PRESENT", so it cannot be
considered a CURRENT or HARD fault.
2) All solenoid circuits are in the same harness and a common
ground wire is used for the solenoids. Use the following figures to
identify the harness and connector to inspect. See Fig. 7 and 8. if
all 3 solenoid faults are present, repair the Black wire (Cherokee)
ground wire open condition.
3) Carefully inspect the entire suspected circuit. Pay
particular attention to connectors, corrosion, accident damage, and
improper or missing parts.
4) If any problems are found, make the appropriate repair.
Then perform TEST 1A using the DRB-II.
5) Erase fault codes.
6) If no problems are found, perform the SYSTEM TEST using
the DRB-II. Re-check for fault codes. If there are no fault codes,
perform TEST 2A - VERIFICATION TEST . If fault code(s) return, perform
TEST 1A - VERIFICATION OF THE COMPLAINT .
Fig. 7: Test 3A - Location of 7-Way Connector
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Fig. 52: Test 5A - Transmission 7-Way Connector (Female Side)
Fig. 53: Test 5A - Code 702, View of Speed Sensor Connector
TEST 6A - CODE 703 - GEAR SELECT SWITCH CIRCUIT
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Fig. 54: Test 6A - Code 703, Flow Chart (1 of 2)
Fig. 55: Test 6A - Gear Select Switch Schematic (Cherokee)
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Fig. 56: Test 6A - Location of Gear Select Switch Fuse (Cherokee)
Fig. 57: Test 6A - TCU 32-Way Connector (Cavity 8)
Fig. 58: Test 6A - Code 703, Flow Chart (2 of 2)
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Fig. 59: Test 6A - Gear Select Switch Schematic (Cherokee)
Fig. 60: Test 6A - Code 703, TCU 32-Way Connector (Cavity 9)
Fig. 61: Test 6A - Code 703, Location of Gear Select Switch
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Fig. 62: Test 6A - Code 703, 8-Way Black Connector Cavity "E"
Fig. 63: Test 6A - 8-Way Black Connector Cavity "A" (Cherokee)
TEST 6B - CODE 703 - GEAR SELECT SWITCH CIRCUIT
NOTE: Perform TEST 6A - CODE 703 - GEAR SELECT SWITCH CIRCUIT
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Fig. 65: Test 6B - Gear Select Switch Schematic (Cherokee)
Fig. 66: Test 6B - Code 703, Location of Gear Select Switch
Fig. 67: Test 6B - TCU 32-Way Connector (Cavity 8, Cherokee)
TEST 6C - CODE 703 - GEAR SELECT SWITCH CIRCUIT
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NOTE: Perform TEST 6A - CODE 703 - GEAR SELECT SWITCH CIRCUIT
before proceeding.
Fig. 68: Test 6C - Code 703, Flow Chart