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PAGE 50 — MAYCO C-30HDG PUMP — OPERATION AND PARTS MANUAL — REV. #6 (04/02/12)
C-30HDG PUMP — ENGINE FAULT CODES
Malfunction Indicator Diagnostic System
The Mayco C-30HDG concrete pump features an engine malfunction indicator lamp found on the control box
(Figure 32). When a malfunction in the operation of the engine is detected, the orange check engine light will illuminate.
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HIG
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EMERGENCY
STOP
CHECK
ENGINE
WARNING
LAMP
PUMPING CONTROL
IGNITION SWITCH
OFF
ON
START
Figure 33. Ignition Key (Off)
Figure 34. Com. Port A Connector/Jumper
IGNITION SWITCH
OFF
ON
START
Figure 35. Ignition Key (On)
Figure 36. Leader Code
There are 2 methods of determining an engine malfunction. The
first method is to connect a computer to the test port connector,
the second method is to connect a ground wire to the
Communication Port A connector using the check engine indicator
lamp on the control box to determine the error code. The indicator
lamp will flash in sequence to indicate an error code. Use the
Diagnostic Error Code Table (Table 7) to troubleshoot the
malfunction. The second method will be discussed in this manual.
The following steps use the MAP sensor as an example so that
the user may become familiar with the troubleshooting process.
Example:
1. Open hood and disconnect MAP sensor connector. See
Figure 31.
2. Close hood and start engine. Let engine run for 3 to 5
minutes.
3. Verify that check engine warning lamp on the control box is
on (lit). See Figure 32.
4. If the check engine warning lamp is on, stop engine. Place
ignition key in the OFF position. See Figure 33.
5. Locate communication port A test connector as shown in
Figure 34. Remove plastic cover so that the male connector
pins are exposed.
7. Close hood and place ignition key in the ON position
8. Observe check engine warning lamp flashing 3 consecutive
times and repeating 3 times. This 1-1-1 sequence is defined
as the leader code.
Figure 37. MIL Flash Error Code
Figure 31. MAP Sensor Connector
Figure 32. Engine Warning Lamp
9. The check engine warning lamp will flash in 3 separate
bursts as shown below. This sequence of lamp flashing
represents the MIL flash error code. See Table 7 for a
complete listing of error codes. In the MAP sensor example,
the error code is 127.
6. Connect a jumper wire between the
brown/white
wire (pin
A) on the com. port A connector and chassis ground. See
Figure 34.
10. To correct MAP sensor error, remove jumper wire, reconnect
MAP sensor connector (See Figure 31) and restart engine. It
may be necessary to restart and stop the engine a few times
in order to clear the error from the check engine warning
lamp. Allow engine to run 3 to 5 minutes.