rv-sprinter
07 Winn View 23J - 06 T1N (NAFTA)
2006 Sprinter with Heater Booster (HB) that has not worked since I purchased the rig with 64K miles. No 7 Day Timer. Coolant Pump works fine with REST button. I tried the suggestions mentioned on the forum, including pulling fuses 1 and 6 with engine running and HB button on, but HB never fired. Pulled the HB and removed cover over the fan. Fan moves but is crunchy sounding. Cleaned around fan base and housing and now sounds better, but is still slightly crunchy. Placed HB on bench and connected 12VDC battery to pins 1(+) and 2(-) on HB harness. Then 12VDC to pin 6 to enable HB. Fan never moved, but should for 2 to 3 seconds during pre-start check per my forum reading. Is it correct to assume the HB ECU is dead or is there something else I need to do to power the HB ECU?
Removed ECU and checked resistance:
---------------------------------------------
66.2 ohms Fan Motor
0.6 ohms Glow Plug
12.06K ohms Overheat Sensor @70F
11.56K ohms Temperature Sensor @70F
0.8 ohms Flame Sensor
I believe all readings are reasonable?
Thanks,
Patrick
Removed ECU and checked resistance:
---------------------------------------------
66.2 ohms Fan Motor
0.6 ohms Glow Plug
12.06K ohms Overheat Sensor @70F
11.56K ohms Temperature Sensor @70F
0.8 ohms Flame Sensor
I believe all readings are reasonable?
Thanks,
Patrick