TM 5-3805-298-23-1
0090
Table 1. 420 Secondary Steering System Diagnostic Codes - Continued.
090
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
Test Step 2. Test for Faulty
420-7 Secondary Steering
Secondary Steering Signal.
System Is Not Responding
Properly - Continued
1. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-298-10).
2. Within three seconds, attempt to
The Machine Steers and Secondary
Steering Indicator Is Off - Proceed to
steer the machine. Observe
Test Step 3.
secondary steering indicator
(TM 5-3805-298-10).
The Machine Does Not Steer and
Secondary Steering Indicator Is Off -
Proceed to Test Step 6.
Test Step 3. Test for Open Wiring
Harness.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Disconnect connector A
(WP 0012, Figure 105) from
secondary steering relay.
3. Install a jumper wire between
connector A (WP 0012,
Figure 105) and ground.
4. Remove left lower cab access
panels (WP 0347).
5. Remove transmission ECM cover
(WP 0266).
6. Disconnect connector C-C12
(WP 0012, Figure 26) from
Transmission ECM J1.
7. Using digital multimeter
Resistance 5.0 Ohms or Less -
(WP 0174), measure resistance
Replace transmission ECM (WP 0266).
between connector C-C12
Proceed to Test Step 10.
(WP 0012, Figure 26) terminal 24
Resistance Greater Than 5.0 Ohms -
and terminal 13.
Proceed to Test Step 4.
Test Step 4. Test for Open Lower Cab
Wiring Harness.
1. Remove right lower cab access
panels (WP 0347).
2. Disconnect connector M-C1
(WP 0012, Figure 57) from
connector C-C20 (WP 0012,
Figure 56).
0090-3