Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
190
30.
DTC P1608
ECU instrument panel preheating indicator lamp output connecting wire is
short to high level.
P1609
ECU instrument panel preheating indicator lamp output connecting wire is
short to ground.
P160A
ECU instrument panel preheating indicator lamp output connecting wire is
open.
P160B
ECU instrument panel preheating indicator lamp output wire drive module
is overheated.
Fault Description: During glow plug operation, preheater relay will send a signal to ECU. Then, ECU sends
command to preheating indicator lamp on instrument panel via control circuit. Driver carries out the next operation
via observing preheating indicator lamp status. ECU monitors the circuit between ECU and instrument panel for
conditions as follows:
It is short to ground.
It is short to voltage.
It is open.
When ECU detects incorrect voltage signals, DTC occurs.
Diagnosis Hint: Check harness for intermittency and good contact.
Prior to component maintenance, remove all fragments from connector surface. Check connector pads for correct
installation to prevent contamination from entering prior to diagnosis and component replacement.
z Poor terminal connection—Check harness connectors for looseness, mismatching, retainer damage, improper
shape or damage and connection failure with wires. Apply corresponding matching terminals for test of proper
tension.
z Harness damage—Check wire harness for damage. In the case of no harness faults, move relevant connectors and
wire harness and observe display of fault diagnostic apparatus. Fault diagnostic apparatus displays changes to
indicate fault positions.
z Check ECU and engine ground connection for reliability and cleanness. If it is determined that DTC is an
intermittent fault, please refer to Fault Record to check the time of last DTC occurrence.
Terminal ECU
K92 Preheating time indicator lamp
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