Table 2. Engine Troubleshooting with Codes for the 120M Motor Grader - Continued.
CDI FMI CODE
1589-03 Turbocharger Inlet
Test Step 1. Test Signal Circuit.
Air Pressure Sensor Volt-
N OT E
age Above Normal Code -
Always inspect the harness connectorsthat are involved in the circuit.
Poor connections can often be the cause of a problem in an electrical
circuit. Verify that all connections in the circuit are clean and secure,
and that all connections are in good condition. If a problem with a
connection is found, correct the problem and verify that this diagnostic
code is active before performing this procedure.
Perform open or short circuit test ateach harness connection to identify
correct harness to replace.
Perform this test only if condition is active.
Engine ECM C6.6 120M and ver-
ify 1589-03 is active.
2. Turn ignition switch to the OFF
3. Disconnect the turbocharger air
inlet pressure sensor harness
4. Install a jumper wire between har-
Figure 26) terminal C and ground.
5. Turn ignition switch to the ON
N OT E
Wait at least 30 seconds in order for diagnostic codes to become active.
1589-03 Remains Active - Proceed
to step 9.
Engine ECM C6.6 120M, and
check if diagnostic code 1589-04
1589-04 Becomes Active - ECM and
signal circuit test OK, proceed to
7. Install a jumper wire between har-
Figure 26) terminal B and terminal