TM 5-3805-298-23-1
0087
Table 1. 291 Demand Fan Solenoid Diagnostic Codes - Continued.
087
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
5. Disconnect connector M-C1
291-3 Demand Fan Solenoid
(WP 0012, Figure 57) from
Voltage Is Above Normal -
connector C-C20 (WP 0012,
Continued
Figure 56).
6. Using digital multimeter
Continuity - Replace rear frame wiring
(WP 0174), test for continuity
harness (WP 0295).
between connector M-C1
Proceed to Test Step 4.
(WP 0012, Figure 57) terminal 4
No Continuity - Proceed to Test Step 3.
and all other M-C1 terminals.
Test Step 3. Test for Shorted Lower
Cab Wiring Harness.
1. Remove left lower cab access
panels (WP 0347).
2. Remove transmission ECM cover
(WP 0266).
3. Disconnect connector C-C12
(WP 0012, Figure 26) from
Transmission ECM J1.
4. Using digital multimeter
Continuity - Replace lower cab wiring
(WP 0174), test for continuity
harness (WP 0291).
between connector C-C12
Proceed to Test Step 4.
(WP 0012, Figure 26) terminal 67
No Continuity - Replace transmission
and all other C-C12 terminals.
ECM (WP 0266).
Proceed to Test Step 4.
Test Step 4. Verify Malfunction Is
Resolved.
1. Ensure all harness connectors are
connected.
2. Install fan (WP 0234).
3. Install transmission ECM cover
(WP 0266).
4. Install right and left lower cab
access panels (WP 0347).
5. Using MSD, check for active
Diagnostic Code 291-3 Demand Fan
diagnostic codes (WP 0008).
Solenoid Voltage Is Above Normal
Becomes Inactive - Troubleshooting
complete.
Diagnostic Code 291-3 Demand Fan
Solenoid Voltage Is Above Normal
Remains Active - Repeat
troubleshooting from the beginning.
0087-3
