TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 INTAKE MANIFOLD HEATER ABNORMAL OPERATION 0023 00 MALFUNCTION 1: (Continued) Manifold heater inoperative. Manifold heater Voltage Checks NOTE Disconnect purge pump fuel hose quick-disconnect coupling at engine before performing test. PROCEDURE OBSERVATION ANALYSIS 24 volts at manifold heater switch, both connectors. Proper voltage through manifold heater switch. No voltage to switch. Defective circuit. See appropriate vehicle technical manual. No voltage from switch. Defective switch. 24 volts at engine bulkhead connector. Proper voltage. No voltage to bulkhead connector. Defective circuit between switch and connector. See appropriate vehicle technical manual. Check electrical circuit voltages (master switch and manifold heater switch "ON"). 24 volts at solenoid valve(s) supply and return wire connector. Proper voltage to solenoid valves. No voltage at solenoid valves. Defective circuit between connector and valves. See appropriate vehicle technical manual. 24 volts at ignition unit connector. Proper voltage supply to ignition unit. No voltage at ignition unit. Defective circuit to ignition unit. See appropriate vehicle technical manual. WP 0023 00-2