Sensor And Switch Service - Hummer H1 Service Manual

3-40 Fuel, Emissions, and Exhaust
ENGINE TEMPERATURE SENDER
REPLACEMENT
1. Remove nut, lockwasher, lead, and sender from engine
(Figure 3-58).
2. Apply teflon sealant to sender threads, and install sender,
lead, lockwasher, and nut on engine (Figure 3-58).
SENDER
WIRE
Figure 3-58: Engine Temperature Sender
___________________________________________
GLOW PLUG RELAY/CONTROLLER
REPLACEMENT
1. Disconnect battery ground cable.
2. Remove console and engine cover.
3. Disconnect power cable at relay/controller (Figure 3-59)
.
SENDER
Figure 3-59: Glow Plug Relay/Controller Location
4. Disengage three connectors from glow plug controller.
5. Remove retaining bolt and remove relay.
6. Position relay/controller on bracket and install attaching
hardware.
7. Engage connectors in relay/controller.
8. Connect power cable to relay/controller stud.
9. Install engine cover and console.
10. Connect battery ground cable.

SENSOR AND SWITCH SERVICE

The sensors and switches on turbo diesel engines are service-
able parts.
The boost pressure switch is on the passenger side valve cover.
The coolant temperature switch is in the water crossover.
The oil pressure switch is in the valley between the heads. The
MAP and air temperature sensors are at the passenger side of
the intake manifold.
LOCK PIN
POWER
CABLE
BOLT
CONTROLLER
®
CONNECTOR
00-S12-010