7–119 62-11640
26108 RACK POSITION SENSOR ABNORMAL
• ACTIVATION: Sensor voltage > 4.9 V or < 0.3V
• UNIT CONTROL: Engine Operation: Alarm only.
Electric Operation: Will not activate in electric operation.
• RESET CONDITION: If trigger on message not received for 5 seconds, alarm reset or alarm may be
manually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Check Rack Position Sensor (RPS)
Inspect sensor, connector pins & terminals. (See wiring schematic Section 10.) No physical damage
to sensor. No damaged or corrosion in connections.
2. Check Rack Position Sensor (RPS). Refer to Section 8.5.12
3. Refer to 26106 SENSOR SUPPLY VOLTAGE 1 LOW.
26109 ACTUATOR ABNORMAL ENCU
• ACTIVATION: Actuator current >3.0A or < 80mA
• UNIT CONTROL: Engine Operation: Required Shutdown.
Electric Operation: Will not activate in electric operation.
• RESET CONDITION: If trigger on message not received for 5 seconds, alarm reset or alarm may be
manually reset by turning the unit off, then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in Notes Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1. Refer to 05012 CHECK ENCU POWER CIRCUIT
2. Check Engine Control Unit (ENCU) and Fuel Speed Actuator (FSA)
a. Check voltage from fuse F3 through PCM−34 and SP−18 to ENCU−22. Verify correct fuse, see Fig-
ure 2.5. Must have minimum 11 VDC with the battery connected and SROS in the OFF position.
b. Check voltage from 3MM-9 to ENCU−44. Must have minimum 11 VDC with SROS in the START/
RUN position. If no, energize the run relay output using component test mode (refer to Compo-
nent Test Mode) and retest.
c. Check for ground at ENCU-19 and ENCUGND−A (at the battery negative cable connection). If
ground not good, check connectors and wiring between terminals for damage, moisture or corrosion.
d. Inspect fuel/speed actuator (FSA), engine speed sensor (ENSSN) and engine speed control unit
(ENCU) connector pins & terminals. Verify no physical damage to components, and no damage or
corrosion in connectors.
e. Check resistance & amp draw of FSA. Refer to Section 2.11 for specifications.
f. Check FSA plunger. Must move in and out freely. Refer to engine manual.
To Next Page
Loading...
Need help?
General
