AIRTRONICS D2 - Page 15

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REVISION LEVEL A - 09/09/15

FAULT CODE / TROUBLESHOOTING

048 - OPEN CIRCUIT - FUEL METERING PUMP (FMP)

Disconnect connector from fuel pump and measure resistance value of fuel pump see values, pg. 20. If resistance values are O.K., then reconnect cable harness

to the fuel pump.

1. Check fuel pump electrical connector.

a. Pins of female plug end can become spread.

b. Re-crimp if needed.

c. Clear code and run unit.

d. If problem persists continue below.

2. Inspect the wiring for damage, check continuity from the 8 pin housing for an external FMP, and 14 pin housing for an internal FMP.

050 - TOO MANY NO START ATTEMPTS - (LOCKOUT)

This is normally not a warrantable failure.

1. Document and clear fault codes.

2. Restart troubleshooting.

i. Reference Code 52.

051 - FAULTY FLAME RECOGNITION

1. Document codes, clear codes, and run unit.

This code is cause from a hard shutdown (power cut off) which prevents a cool down. If upon next start the sensed temperature is excessive the unit will

run a cool down cycle. If the sensed temperature doesn’t fall enough a Code 051 is set. This can be a loose power wire or using the master cutoff while

the unit is running.

2. If problem persists install test ame sensor.

3. If problem is resolved leave sensor in, clear codes, and run unit.

Also refer to Code 52 for no-start situations.

052 - NO START SAFETY TIME EXCEEDED

1. No ame detected on start attempt but unit diagnostics are unable to detect a fault.

2. Check exhaust and combustion piping for restriction (non-warranty).

a. Low spots.

b. Crushes and kinks.

3. Inspect and or replace fuel lter on inlet side of fuel pump, see page 32 (maintenance).

4. Check fuel pump operation.

a. Pump should tick, if so continue to step 5 if not continue below.

b. Install test pump, clear codes and run unit.

You cannot probe the fuel pump plug for voltage - this sets a Code 48 and prevents the unit from running.

c. If problem is resolved install pump, clear codes, run unit and restart troubles shooting. Otherwise continue below.

d. Troubleshoot wiring from pump to harness (non-warranty).

e. If wiring is damaged repair as needed using heat shrink & solder butt connectors.

PLEASE NOTE!