ELECTRICAL
Event Code 314
254
M4.8-1055-044
03 Rev. 10/09
Event Code 314
ECR1 or ECR2 Traction Encoder issue.
Step 1: Verify which motor circuit the problem is in (RH
or LH). With drive wheels elevated and steer wheels
straight, proceed to Analyzer menu A2.3.5 ECR1 (RH
motor) and A2.3.6 ECR2 (LH motor) to read motor
RPM. Select travel.
• If: Motor RPM reads 0 on either motor.
– Then the issue lies within corresponding circuit
RH or LH. Once determined whether issue is in
RH or LH circuit, proceed with Step 2.
• If: Motor RPM reads 0 on both motors.
– Then proceed with Step 2.
Step 2: Verify connections are secure at CA403 pins
1,2,13 and 14 for ECR1 and pins 11, 12, 22 and 23 for
ECR2. Also, verify connections CA426 and CA425 on
traction motors. Also, verify continuity from CA403 pin
connections to CA426 and CA425. Repair/replace as
necessary.
• If: Correct.
– Then proceed to Step 3.
Step 3: The 12 volt (11.3 actual) supply for the motor
encoder is within ACCESS 3.
• If: 11 to 12 volts present.
– Then proceed to Step 4.
• If: 12 volts not present.
– Then replace ACCESS 3.
Step 4: Disconnect CA426 and CA425 encoder con-
nections one at time. Check to see if either the correct
motor speed returns or for 12 volts at CA403-1 and 2
and CA403-11 and 12 accordingly.
Note: ECR1 or ECR2 shorted could affect the 12 volt
supply from ACCESS 3 and make it appear there is no
12 volt supply.
• If: Speed or 12 volts at CA403-1 or 2 returns.
– Then replace appropriate sensor bearing or
(ECR1 or ECR2) motor.
Figure 15627
Crown 2007 PF15665-44 Rev. 10/09
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