SECTION 3 - CHASSIS & TURNTABLE
3-200
3121160
Table 3-15. Symptom Diagnosis
Checks
Action
Important Preliminary Checks
Before Using This Section
Before using this section, you should have performed On Board Diagnostic Check and determined that:
1. The Control Module and MIL (Malfunction Indicator Lamp) are operating correctly.
2. There are no Diagnostic Trouble Codes (DTCs) stored, or a DTC exists but without a MIL.
Several of the following symptom procedures call for a careful visual and physical check. The visual and physical checks are very important. The
checks can lead to correcting a problem without further checks that may save valuable time.
LPG Fuel System Check
1. Verify the customer complaint.
2. Locate the correct symptom table.
3. Check the items indicated under that symptom.
4. Operate the vehicle under the conditions the symptom occurs. Verify HEGO switching between lean and rich.
IMPORTANT! Normal HEGO switching indicates the LPG fuel system is in closed loop and operating correctly at that time.
Visual and Physical Checks
² Check all ECM system fuses and circuit breakers.
² Check the ECM ground for being clean, tight and in its proper location.
² Check the vacuum hoses for splits, kinks and proper connections.
² Check thoroughly for any type of leak or restriction.
² Check for air leaks at all the mounting areas of the intake manifold sealing surfaces.
² Check for proper installation of the mixer module assembly.
² Check for air leaks at the mixer assembly.
² Check the ignition wires for the following conditions:
- Cracking
- Hardness
- Proper routing
- Carbon tracking
² Check the wiring for the following items:
- Proper connections, pinches or cuts.
² The following symptom tables contain groups of possible causes for each symptom. The order of these procedures is not important. If the scan
tool readings do not indicate the problems, then proceed in a logical order, easiest to check or most likely to cause first.
Intermittent
DEFINITION: The problem may or may not turn ON the Malfunction Indicator Lamp (MIL) or store a Diagnostic Trouble Code (DTC).
Preliminary Checks
² Refer to Important Preliminary Checks.
² Do not use the DTC tables. If a fault is an intermittent, the use of the DTC tables may result in the replacement of good parts.
Faulty Electrical Connections or Wiring
² Faulty electrical connections or wiring can cause most intermittent problems.
² Check the suspected circuit for the following conditions:
- Faulty fuse or circuit breaker
- Connectors poorly mated
- Terminals not fully seated in the connector (backed out)
- Terminals not properly formed or damaged
- Terminal to wires poorly connected
- Terminal tension insufficient.
² Carefully remove all the connector terminals in the problem circuit in order to ensure the proper contact tension. If necessary, replace all the
connector terminals in the problem circuit in order to ensure the proper contact tension.
² Checking for poor terminal to wire connections requires removing the terminal from the connector body.
Operational Test
If a visual and physical check does not locate the cause of the problem, drive the vehicle with a scan tool. When the problem occurs, an abnormal
voltage or scan reading indicates the problem may be in that circuit.
Summary of Contents for 740AJ
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Page 116: ...SECTION 3 CHASSIS TURNTABLE 3 64 3121160 Figure 3 44 Swing Hub Prior to SN 0300074383...
Page 203: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 151 Figure 3 77 EFI Component Location...
Page 206: ...SECTION 3 CHASSIS TURNTABLE 3 154 3121160 Figure 3 78 ECM EPM Identification ECM EPM...
Page 224: ...SECTION 3 CHASSIS TURNTABLE 3 172 3121160 Figure 3 83 Deutz EMR 2 Troubleshooting Flow Chart...
Page 228: ...SECTION 3 CHASSIS TURNTABLE 3 176 3121160 Figure 3 87 EMR 2 Engine Plug Pin Identification...
Page 229: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 177 Figure 3 88 EMR 2 Vehicle Plug Pin Identification...
Page 230: ...SECTION 3 CHASSIS TURNTABLE 3 178 3121160 Figure 3 89 EMR2 Fault Codes Sheet 1 of 5...
Page 231: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 179 Figure 3 90 EMR2 Fault Codes Sheet 2 of 5...
Page 232: ...SECTION 3 CHASSIS TURNTABLE 3 180 3121160 Figure 3 91 EMR2 Fault Codes Sheet 3 of 5...
Page 233: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 181 Figure 3 92 EMR2 Fault Codes Sheet 4 of 5...
Page 234: ...SECTION 3 CHASSIS TURNTABLE 3 182 3121160 Figure 3 93 EMR2 Fault Codes Sheet 5 of 5...
Page 303: ...SECTION 4 BOOM PLATFORM 3121160 4 31 Figure 4 20 Rotator Assembly HELAC...
Page 460: ...SECTION 5 BASIC HYDRAULIC INFORMATION AND SCHEMATICS 5 116 3121160 NOTES...
Page 467: ...SECTION 6 JLG CONTROL SYSTEM 3121160 6 7 Figure 6 2 ADE Block Diagram...
Page 534: ...SECTION 6 JLG CONTROL SYSTEM 6 74 3121160 NOTES...
Page 580: ...SECTION 7 BASIC ELECTRICAL INFORMATION SCHEMATICS 7 46 3121160 NOTES...
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