GROVE Published 10-21-2010, Control# 198-04 6-21
5540F/YB5515 SERVICE MANUAL ENGINE AND ENGINE SYSTEMS
3.2 Turn ignition power OFF. Disconnect the ECM from the wire harness. Disconnect the TPS sensor and
drive-by-wire pot. Perform the following measurements.
4. If all MAP tests check out, reconnect all sensors and turn ignition power on. Measure the voltage from MAP
pin B to ground while manually applying vacuum to the vacuum fitting on the MAP sensor. The voltage will
depend on the vacuum, but should read 0.1 volt under high vacuum to 4.7 - 5.0 volts at atmospheric pres-
sure and sea level. If the voltage is within the range, replace ECM.
Code 43: Fuel Injector Error.
The fuel injector circuit is not responding properly. The circuit has an open, short, or lost power from the power
relay. If the injector shows a true fault, it is unlikely the engine would run on gasoline. The injector could be turned
on all the time and therefore it would squirt gasoline continuously when the ignition relay is active. This would tend
to flood the engine; however, it may run depending on loading and other conditions. Verify fuel injector fault.
1. Verify the ignition relay is operating properly as described under Code 64. The ignition relay provides power
to the fuel injector.
2. Disconnect the fuel injector. Connect a volt meter between ground and injector pin A (RD/BK). Switch the
ignition from off to ON. Verify 12 volts is present at pin 87 of the ignition coil during 2 second initial prime
period. If voltage is not present, continue with step 2.1.
2.1 Connect a voltmeter between ground and pin 87 of the ignition coil and fuel injector relay. Switch the
ignition power from off to ON. Verify 12 volts is present at pin 87 during 2 second initial prime period. If
voltage is present, proceed with step 2.1.1.
2.1.1 Recheck the ignition power relay as describes under Code 64.
2.2 Turn OFF the ignition power. Measure resistance from relay pin 87 (RD/BK of the ignition coil and fuel
injector relay) and injector pin A (RD/BK). This should measure less than 1 ohm. If the measurement is
greater repair the wire.
3. With the ignition power OFF, measure the resistance of the fuel injector. The resistance of a room tempera-
ture injector should read 1 -2 ohms. Replace the injector if the resistance is considerably outside this range.
4. Disconnect the ECM from the harness. Measure the resistance of the ECM harness pin 4 and injector con-
nector pin B. This should read less than 1 ohm. If it is greater replace the wire.
5. Measure the resistance from ECM harness pin 25 and injector connector pin B. This should read 0. If it
shows any continuity repair a short to ground.
6. Measure the resistance from ECM pin 1 (switched battery voltage) and injector connector pin B. This should
read 0. If it shows any continuity repair am short to battery voltage.
7. If no short is found and the injector squirts fuel during the initial prime period, replace the ECM.
8. If no short is found and the injector does not squirt fuel during the initial prime period, but the engine runs
normally (without flooding), investigate for battery voltage and charging system malfunctions. Otherwise
replace the ECM.
MAP Wiring Troubleshooting
Meter Mode From To Desired Result If Defective
Ohms ECM Harness 10 MAP A < 1 Ohm Ground wire is open
Ohms ECM Harness 40 MAP C < 1 Ohm 5 volt wire is open
Ohms ECM Harness 8 TPS C < 1 Ohm
TPS signal wire is
open
Ohms ECM Harness 10 ECM Harness 40
Open or <1000
Ohms if DBW pot
5 volt wire is shorted
to ground
Ohms ECM Harness 10 ECM Harness 7 Open
MAP signal shorted
to ground
Ohms ECM Harness 40 ECM Harness 7 Open
MAP signal shorted
to +5 volts
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